SharePoint 2007 - Master Page Picker
Ever wonder how to change the master page on a site or better yet, on a site collection and all of its subsites? If you do it with SPDesigner they will each get stuffed into the content database (Yuk!). Well I have certainly given it some thought and thankfully, Renaud Comte has as well and wrote a Feature that will do it for us. It eliminates the need to customize (a la SPDesigner) by programmatically pointing your site(s) to a file system master page.
It's published on codeplex so be sure to check it out.