Download it here:
MSieve 0.1.0.1 (2-Jan-2006), 347kb
AboutMSieve is a little application which loads a MAME-style XML file (in other words, the output of "MAME -listxml") and allows you to filter out games based on a configurable filter. Then you can save the resulting list in various formats.
Although the application is not polished, I'm releasing it now as a 'public testing version'. Maybe in a near future, I'll add a couple more features and some polishment. Until then, MSieve works and can be used without problem.