To use wavs or MP3's, as ringtones, you typically need to have a SD card and a third party program. Some good ones are RingoPro, mRing, and Call Filter. I recently heard of a free app that will take your mps's and convert them to tones, and put them in your ROM. Neat, but the tones then use lots of memory (Mini Tones).
As far as chat programs, I don't know of Trillian for the Treo, but Verichat is a very good multi-service, always on chat program which can use either your data service or SMS. Mundu is another some folks use and I know there are a few more.
Browse the softward area of Everything Treo- nearly everything has a good free trial period so you can see if the program is what you want.
Good luck with your new toy!
Ginnie
__________________ Greenis
Sprint Treo 755p |