Welcome to the group, veu. The other's are right. It pays to search, and pay attention to the stickies and attention posts at the top of the sub-forums. See, for example:
http://www.blackberryforums.com/blac...tml#post334068.
If IM is your thing, take a look at jivetalk (or maybe search on jive talk). Many, many vets hear swear by it.
Finally, browse the aftermarket software subforum and see the software list at the faq. What's best will depend on your needs and wants.