Good Gtalk/Y IM/Gmail notifier for TP2 (and smartphone too)?

[SweetBearCub]

Hello.

I've recently run into a situation where I need a good mobile Google Talk client. Having never been a heavy user of IM programs before since the TP1's keyboard was a pain to type on, I'm a bit lost.

The program should meet the following criteria, if possible

- Free of cost to download and use main features.
- Support communications with Google Talk and Yahoo! clients.
- Support notification of new mail in associated Gmail and Yahoo inboxes.
- Support IM logging. (Local/server - For example, Yahoo logs IMs on their servers)

If it supports other clients (MSN, AIM/ICQ, IRC, etc..) that would be nice.

Since I occasionally switch phones for various reasons, if there is a similar program that could run on a smartphone (non-touchscreen Windows Mobile device), that would be nice too.

Thanks!