PC-like keyboard emulation on Mac OS X 10.6.3
The quick answer is "no".  Each application is going to have its own set of keystrokes to perform certain actions, and most of those are built around the OSX standard way of doing things.  For example, in Firefox Command+1 will always be the option for the first tab, even if you find some way of doing what you want.  Command+Tab will not cycle through individual windows, only applications, etc.

You can try some of the "shortcuts" listed in this similar question, or this similar answer, but this is basically adding training wheels, and is not likely to work with every application.

For the long run, your best bet is to ditch the PC keyboard (not that it makes any difference, except what logo is on the Command key) and start learning.  After a week or two of using OSX every day, you'll probably find that your level of comfort with your new OS has skyrocketed, and you're using command+v to paste without thinking about it.