Those Windows games don't have to be trapped in that partition you rarely boot into. Instead, you can use Wine or Cedega to play them.
Wine (http://www.winehq.com), the open source Windows compatibility layer [Hack #87], is well known for its ability to run many popular Windows applications, and even certain Windows components such as Internet Explorer. Wine can also run some popular Windows games, though gaming is not its primary focus. Still, if a game runs successfully in Wine, then Wine is probably the best way to play it. It is usually a fairly straightforward matter to install and play games in Wine, not to mention the fact that Wine itself is free and open source software.
Still, there are other game-playing solutions for Linux that may often produce better results. That is certainly the case when it comes to classic, DOS-based games. For these, DOSBox (http://dosbox.sourceforge.net) is your best bet. DOSBox is a free and open source x86 and DOS emulator that runs on multiple platforms (including modern versions of Windows and Mac OS X, as well as Linux). It is especially good with older games.
DOSBox is included in Ubuntu's universe repository [Hack #60], and it is generally up-to-date. So you can simply install it by running:
sudo apt-get install dosbox