I think I have my 7130e pretty much dialed in as far as the device is concerned, and just wonder if there's any essential software or tools I should get to get the most use/enjoyment out of the device.

I have PocketDay to show unread email, missed calls, appointment and tasks (not interested in stocks or world time). After setting up links to a multitude of things, I found it best for me to only set up a link for Google for web searches (under G), one for Google maps (under M), one for calculator (under C) and the key lock (yep, under L).

Also, I ordered a Motorola bluetooth headset and should have it in a few days.

One of the things I had hoped to use on this phone was a tool I created in excel, but I found out after I bought the phone that the support for excel files is just reading them - not editing them.

there is a program that you can download that you can edit in excel
via eCell by DynoPlex Inc. - Handango BlackBerry 7290 Document Management Software

What BB apps do you have? is particularly useful in finding out how others maximize the use of their devices through third-party software. Take a look.