blt shows you what your twitter friends are doing while you're working at the commandline, in Linux, BSD, OS X and Cygwin under Windows. In more detail, it's a perl script which integrates the checking of twitter into bash(1). Think of it like biff(1) for twitter. It should be considered alpha at present. blt is released under the GPLv3 with no warranty.
marnanel@charcoal:~$ firefox &
[1] 6730
<wombats> deliriously happy
marnanel@charcoal:~$ blt @wombats: watch out for her siblings
marnanel@charcoal:~$
Type cpan App::BLT at your prompt; you will need ~/perl/bin in your path. Or, type sudo cpan App::BLT in which case everything should just work. If not, let me know (tthurman at gnome point org) and we can try to figure out why together.
blt is automatically set up based on questions it asks when you first run it.