Ubuntu 9.10 comes with an older version of weechat. So I downloaded the stable release 0.3.0 and installed it:
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./configure --prefix=/home/leon/Software/local/ --enable-gtk --enable-demo make make install
Note: gtk is not very usable so you better use the ncurses interface!
I wrote a little plugin for it that autosaves the current connected channels and enables autojoin for them. It can be found on my github page and on the plugins page of weechat (if FlashCode aprobes the new version 0.2).
And here a nice plugin of weechat in action with the autojoin plugin (Nice!!):