I found an app called QuickIM
It was easy to setup and easy for me. I installed it on my Blackberry 7250 and I was good to go. Probably the best advanatage that I have found is simply being able to have QuickIM run in the background while I am doing other things, but also being able to use emoticons. Just like home. I recommened it! Its the first program on my list.
Check it out for yourself, at least download it and give it a try. Visit QuickIM.com