Bill Gates is even scared of Linux Torvalds. Microsoft is as good as gone if Windows 7 turns out to be another bad OS. That's why microsoft is putting so much effort into Windows 7.
Just use the quick search option in Synaptic to search for webmin or what ever package you want.
Edit:
Once you've finished administering your system and have settled down to just using it, you mind find trying this out to be a little fun!
True it has been fixed, but that is a rare case.
As lauriecallentine suggested, many Windows problems like this are best fixed by reformatting. *feels secure on Linux*