Lee Crowe has made updates to this plugin. Check out his blog post about it: http://world.episerver.com/Blogs/Lee-Crowe/Dates/2011/7/Introducing-Page-Type-Builder-UI/
Fixed bug comitted in the comment below, thanks for the input. Also added a link to each pagetype and also a link directly to the property if there was a mismatch.
Using PageTypeBuilder when creating EPiServer web sites?
Then you're probably aware of when removing properties in code, they won't change in EPiServer. Same thing when changing a property type in PTB, it won't change in EPiServer.
In larger projects with a lot of inheritance between page types this can be really annoying, going through all page types and remove/change properties. So I created a plugin that displays miss matches between EPiServer and PTB-properties. In the plugin you can also delete unwanted properties, but for now you can't convert them to another property type.
Read more at: http://antecknat.se/blog/2010/11/10/find-miss-matches-between-episerver-and-pagetypebuilder-properties/