Not sure how many of you are linux guys, but one of my projects has been to develop a debugger for Linux (and eventually other *nix platforms) with the usability and extendability of OllyDbg.
So if you are interested, please give it a try and let me know what you think :)
http://www.codef00.com/projects.php#Debugger
Just keep in mind this is a pre-1.0 release so it will have bugs and incomplete features, but I think it is generally usable enough to get a feel for what it will be like.
Thanks,
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