ejabberd to login to different xmpp server

Hello,
I can login to ICQ with icq transport fo ejabberd, same goes here for MSN and MRA/MRIM, Yahoo, etc...
But what if I'd like to log into bunch of different XMPP(Jabber) servers? it should be useful to, say, show my presence on a LJ page by mean of their lj-talk, same goes here about Google and their GTalk, etc. I'd like to keep my LJ friends on a contact list with my LJ nickname, same goes here about GTalk contacts, etc. Also, I'm pretty sure it's obvious to keep the account safe from "I-forget-password" attacks by mean of their support.
Even in sight of that many advanced features like blogging on LJ and multimedia on GTalk unavailable with such a plain IM service ( jabber-to-jabber transport ), it should be very useful to chat to GMail contact with GMail account exposing with my Google nickname my public Picasa/Blospot/etc. to a buddy, isn't it?
So, I have an idea for such a piece of software and have no idea why isn't it created yet. :)
Thanks for attention.