Hello there
I just noticed that the new Mercurial bundle uses cmd-H to activate its commands. I use this shortcut very often for hiding Textmate and other applications. It's a system wide shortcut for hiding applications. So I might not be the only one doing this. It's no big problem for me since I can always disable the bundle with the filter. All the same it might be a good idea to change it to anoter shortcut.
Cheers. Oliver