I looked at the bbpixel integration and one by phil taylor. There is a new one out, vbridge, as of a few weeks ago. Yet that one remains shakey if you follow the threads on it. Merging of databases and They all have major issues. The one major issue almost all of them have is the requirment for empty user databases. Iit is certainly easy enough to do that and backup and restore your user info, but quite painful none the less.