For several reasons, I decided to make Jabber my Instant Messaging system of choice and I intend to gradually phase out my ICQ. If you have Jabber-enabled client and Jabber/GoogleTalk account (if you have GMail, you automatically have GoogleTalk account!), please try to use my Jabber/GoogleTalk handle "firstname.lastname@example.org" from now on, instead of my current ICQ UIN. (There are several IM clients available that can handle both ICQ and Jabber messaging at the same time.)
This does not mean that from tomorrow you cannot reach me using ICQ. Whenever I'll be online at ICQ, I'll also be online at Jabber/GoogleTalk - however, the reverse is not true. There will be instances when I'll be available exclusively on Jabber/GoogleTalk.
I am trying to use ICQ -> Jabber Transport gateway and I have some problems with it. If you send me an ICQ message and get the exactly same message back as a reply, that means I didn't authorize you yet. In that case, please e-mail me with your ICQ number and I'll authorize you.
UPDATE: Because Google is supposedly working at interoperability of GTalk and AIM (=ICQ), most of this post is practically moot.