ive been using jaiku for about 15 months now, from the early beta days in julyish last year when it crashed my (albeit non supported) 3230 and then again in november after i got a bit bored of twitter. ive had it running almost non stop on my phone since february of this year and the latest client makes it a joy to use.
basically jaiku is something that integrates your phones address book with a service that allows you to talk to your friends. i tried to log into the site a little while ago and it was down for some reason, then i check the site again only to find that they have been bought by google!. fantastically brilliant news. wondering how it ties in with all the gphone talk as of late.