Well Colemak has all the shortcuts in the same place or equally easy places. I used that thing too when I was on Dvorak, but you don't need it for Colemak. Q, W, X, Z, C, V are kept in place, and S is pretty close. (I use save a lot when programming.)

Colemak has all the shortcuts plus it's better than Dvorak. Learn it.

I used that when I was learning Dvorak before I knew of Colemak.  It was nice, but most of it's still there with Colemak and and Cmd-S is on stronger finger and I don't have to reach for Cmd-T or move my finger for Cmd-N for example so it didn't take long to let go of that.  The fact that Apple would have seen a need to come up with that special Dvorak setup shows that Colemak has got the right idea.

This is really weird... it looks like the original QWERTY key positions are default when using them with command in Firefox (I'm using Firefox 3) but go back to colemak in any other program...
Has anyone else noticed this phenomenon? Maybe I just need to restart Firefox for it to recognize colemak... but it shouldn't, because switching between the two in the input menu is good enough for all the other apps.

At any rate, it doesn't really matter, because I figured out a way to essentially make a colemak-qwerty like the dvorak-qwerty... I downloaded Ukelele, and started a new layout based on the colemak layout that I had downloaded, and after much frustration, I managed to map the corresponding QWERTY keys to important keys that don't match in colemak only when command is being held down.
For the record, Ukelele is a damn glitchy program, but if you can get it to work, it's pretty handy. I also used it to map caps lock to ctrl+backspace... that way I can still use the caps lock key as backspace, but if I ever really really want caps lock I still have the option.
@ Keyboard Samurai, I hear what you're saying about some of them being under stronger fingers... and given that, I may try to switch to full colemak down the road, but for now, and at least until I figure out why firefox is behaving separately, I think this is the way to go.

If anyone is interested in what I did with Ukelele and you don't want to mess around with Ukelele yourself, let me know in this thread soon and I can send it to you.

Thanks for everyone's input.

I understand that it's been eight years, but I really need Colemak with command layout as it is in Qwerty. Asdffff, can you send me the files, please? :)

I think I can use Ukelele for this, the app comes with the layout for Dvorak Qwerty ⌘, but I haven't figured out how I should make it yet. When I used Windows, I solved the problem by making my own layout. I opened MSKLC, and just re-saved Colemak under a language different than English, Ukranian in my case, and it worked well, all hotkeys with a control key pressed down were as they are in Qwerty. If I manage to create a keyboard for Mac with all commands as in Qwerty, I'll post a link to it here.

Thank you so so much, 39aldo39. I've downloaded your keyboard layout, and it works just right. I may later try other options out with your KLFC, like moving the right side of the layout one column right, but for now that is just what I need :-)