These two free software programs will help you convert the flac files. Also if like you you download a lot of songs from ITunes you can conveert them to other formats to listen too.
Convert Flak Files http://mikewren.com/flac/
Walkthrough http://wiki.etree.org/index.php?page=FlacFrontend
Walkthrough http://www.bpurcell.org/blog/index.cfm?mode=entry&entry=1036
Hymn http://www.hymn-project.org/download.php
The JHymn program is a variant of the original hymn program, written in Java, which provides the same basic functionality as hymn but with a cross-platform user interface, built-in FairKeys-like functionality, and extra features such as enhanced "scrubbing" and direct conversion of DRM-protected files to MP3. It comes with ABSOLUTELY NO WARRANTY to the extent permitted by applicable law. JHymn is licensed under the GNU GPL.
Sorry if this has been posted beofre. But a couple people have asked me this already so I thought the odds are there are others who it could help.