Fring - IM & VoIP client

I needed a Google Talk client on my mobile a while ago and discovered Fring, they provide a Symbian client (as well as other platforms) that allows you to connect to most of the IM networks (Google Talk, MSN, AIM, ICQ, Y! & Skype) as well as providing free VoIP calls to other Fring users at least.

I've been using it on my Nokia E71 quite a bit, it's a pretty good mobile IM client although your friends seem to get ads with every message you send. The VoIP side works pretty well too, even spoke to someone while they were down in South America!