Matter of opinion of course, i think yahoo messenger is waay better than gtalk. In fact i hate gmail in general. I only have an account because google owns the internet now.
To OP:
I use meebo for yahoo. Works great, except it didnt auto import my contacts.
And i think gtalk mobil app needs work. There is no visual notification when a message come in. The icon should indicate it just like a mail icon or newsreader. All others do, this is an obvious oversight.
