Apple's new iWork programs seem to be able to open PowerPoint and Word files fine for basic documents. I have read about problems with some features not importing properly though. You could look into OpenOffice for OSX as well. The easiest, but not the cheapest, solution is to just buy MS Office for the Mac.
As far as I know there is no way to use Access databases on Macs without resorting to Virtual PC. Microsoft even recommends Filemaker if you want an easy to use personal database on your Mac.
goates