Fiat lux » Extracting iPhone Backup Data with mobilesync-inspect - and another tool that is available for OS X and Windows for this purpose.
Archive 27. February 2010
iphone-backup-decoder - Project Hosting on Google Code - the same again as a command-line script in Python. Possibly even more interesting for me than the GUI tool.
iPhone / iPod Touch Backup Extractor - since iPhone backups are binary files and a friend now has problems with a corrupted backup, I linked this tool as a precaution, with which you can extract files from potentially defective iPhone backups, as long as the basic structure of the sqlite files is still somewhat clean.
Menial » Base - and if you just want to quickly take a look into a SQLite database with a GUI tool, this shareware tool doesn't look so bad.