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Hmmm...if your new domain has different keywords than the old one then I would think that it is a matter of the manual penalty not lifting off yet. But there could be other factors.  Is your new domain all completely unique content?  If it is duplicated from elsewhere then the pattern of ranking for a while and then disappearing could fit with Panda. It's also possible that the ranking you saw initially was a "honeymoon boost" and perhaps the new site has dropped out of the honeymoon boost phase and into it's normal ranking position and just needs to attract links to start to rank properly again.

mix them up, you dont want your anchor text to be all the same, Web developer Web development web dev a local web developer web design website development Looks a lot more natural

Hey Matt, thanks for your answer! Just did a test and it doesn´t work very well...did some tests with domains I already know and they didnt show me the 301 redirect domains... Any other options? Thanks, Greg