The b5media WordPress mastermind, Mark Jaquith, has a great tip on merging multiple WordPress blogs.
Here’s my tip: do not select an existing blog user to “own” the imported content! Instead, create a new temporary user just for that content. Here is why: the imported posts may need some manual cleanup, like integration into the new blog’s category structure, or adding/removing tags.
Why? Check out his post for an answer to that. Wise words, take it from someone who’s merged 7 blogs into 1 successfully…
Thord Daniel Hedengren is a designer, writer, and blogger, and also the former editor of The Blog Herald. He used to be a hotshot in the gaming industry in Sweden, but sold everything and went International. Most recently he wrote a book called Smashing WordPress: Beyond the Blog, and does loads of kickass design.