In my case Worldmate with a gold subscription has proved useful. Keeps the flight schedule organized in one place, integrates with possible appointments in the calendar, allows to mass share flight itineraries and meetings with the rest of your team with one click, even offers alternatives on cancelled flights and helps with hotel bookings. Even if you crash horribly and/or you misplace your bb getting all your info back after you get your hands on a working handset again is a matter of seconds, log in with username/password and automagically your 20 flight hops with the 30 hotel bookings, the addresses of all 45374545 meeting times and addresses and the 457345634534 confirmation numbers you have no chance on earth remembering are on your fingertips again. You can even select map integration between bb maps or google maps. Uber cool. I give it an 8 out of 10 because of some delays on flight status updates.
Gypsii also works lovely. Although i mostly use it for real time tracking of friends and coworkers (in a google latitude fashion) the interface extends the interaction to updating third party social networks or share photos and info on places that latitude doesnt cater for. Once again uber cool.
Podtrapper is easily the best coded audio/video feed syndication app in app world. Allows for extensive granularity per feed settings, the interface looks really nice and makes sense, it's fast, goes easy on the batt, and if you mail the developer you get a personal reply in seconds. Can even impersonate iTunes if you're polling Apple Store podcast/videocast feeds! Polls daily The Wall Street Journal This Morning for me, along with the LSE lectures and EconTalk, even the videos from Tedtalks play with no issues!! Drop a 16G micro sd in and sail away. Love! Love! Love! Worth every penny.
Repligo Reader is hands down the best PDF rendering app available. Recently released a new update and it's now even better, the "reading view" mode is crisp and clear, refreshes and displays pages suspiciously fast, i have thrown on it pdfs from a few kb to a few megabytes, from text to mathematical equations to pdfs with embedded photos to japanese text and it hasn't chocked on me once. If you're in the market for a pdf reader that's the one to get, take my word for it.
CardKaller is another app i frequently ab(use). Although the intended use is to preset calling card information and then use the contacts integration to call far away acquaintances using the calling card tariffs with a couple of clicks i slightly use it in a different manner. Instead of calling cards i have setup DTMF authentication on the work telephone exchange and one personal exchange i maintain in a colo that terminates on a voip service. Since RIM would never allow us to drop transport on voip services and our carriers wouldn't entertain the idea any time soon either i can now hook on my personal PBX just by calling a local rate termination number (i can have one in every country on the globe, they're dirt cheap) and then get a dialtone and call over voip any number on my contact list with 2 clicks. I don't even have to dial a single digit. I login, authenticate, get a dialtone and call out just by selecting the contact. I still use minutes, but im having transatlantic conversations on a local call dime. Works for me.
Wikimobile from Bonfire Media is a nice wikipedia app, rendering is fast and when bored that "Random Article" button comes handy.
A couple of banks i deal with in far away lands have apps that integrate directly with the accounts. Allows for transfers, balances, payments, even sends alerts triggered by pre configured events. You can cancel cards, check balances, make payments or order currency. Handy and fast. HSBC, first direct, Ulster and a handful more all support the platform. For some strange reason it's the fastest app on all my blackberries this far.
Trading platforms have also jumped on the berry bandwagon. From small CFDs to full blown direct access platforms there is almost in every vendor a blackberry app with *some* degree of usability. Personally i find the app from ig the fastest/most responsive but i dont use it much (mainly because my ig account is rather small, and because i have access to proper trading terminals that hook directly to true time feeds that are easier on the eyes) For monitoring purposes while on the road though fills the gap nicely. For me that is, i know people that actively mobile trade.
And that's basically it as far as "production" tasks go. Now for entertainment Vision for Youtube has to be the best youtube app (surprisingly it's free), Kobo has a rather nice working interface for buying/previewing book titles, Chess by Odessys is hands down the strongest chess engine available (on the high settings of the paid app, not the free mode on the free one) and even allows for FICS playing over the network with remote players! You can challenge people all over the planet, play some quickie 5min blitz chess over lunch or practice your openings strategies. Works over EDGE, works over 3G, no delays, no choking, no spinning bottles, bliss. The magic of the intrawebs!
Hope i gave you a couple of ideas
Oh, and welcome to bb world!
Disclaimer: The above describe personal experiences, none of the above mentioned companies pay me anything, i buy my own apps. if you use some/any of the above mentioned apps and doesn't perform for you i can do without the b/itching. i DO NOT encourage you to go spend your money on any of the apps mentioned and if you do please don't come to me with support issues. Vendor support channel details would be made available to you with your purchase, use it.