What do you use for instant messaging?
On the E61, I use Agile Messenger for instant messaging quite a lot.
Often, I just leave it on in the background when I’m working or when I’m going somewhere. It buzzes me if someone sends a message. It’s pretty intuitive — the only arse being the memory management on my E61. (If I bring up the web browser, for example, Agile Messenger seems to close immediately.)
I reckon the Blackberry implementation of Google Talk is probably the best example of handset-integrated instant messaging — I used to use this a lot, while I used IM+ on the Blackberry to get me access to the other IM services.
What do you recommend?