Warning to Digsby users
Update: Digsby rep commented below this hasn't been activated yet it was just in the terms for a future version which they plan to make more transparent. (Aug 17, 2009)
When it comes to program installation, I'm a strong believer in caveat emptor. If a software publisher warns you during the installation process that it will install the Yahoo search bar or a Firefox extension along with its program, and makes it clear that you can opt out of it, then so be it. Nobody's forcing a gun to your head, and it's important to read each of the installation screens no matter which program you're installing--at the very least to make sure that the program is not legitimately changing a directory or installing somewhere you don't want it to be.
If you use digsby beware that they are using your idle cpu to run mathematical problems for profit. Its buried in the terms of service where you give them permission for this. The big stink over this is that most people that use it were unaware of it because most never check the terms or blogs of the sites they are getting the software from unless something goes wrong.
Reason's you may not want this is that it uses your computer resources and extra power to run these problems. You can turn it off which they explain on their blog and forums.
Lifehacker has a list of the five best instant messengers if your interested in an alternative
I use to like and run digsby all the time but when they started bundling crap like like toolbars and other things in there, that was it for me. While I don't like ads in programs, they bother me much less than toolbars and installing other random programs that monitor my behavior. But then again I don't use im as much as i use too so I am even less inclined too.