Everything is fine, ALL bottle conditioned beers, NOT JUST HOMEBREW have sediment in it....It's just like trub in the bottom of a fermenter, the yeast that ferments the priming sugar flocculates and settles in the bottom of the bottle.
You can read all about bottle conditioned beers and sediment here; http://www.homebrewtalk.com/f36/anyone-using-filter-bottling-123758/#post1379528
There's even a video that teaches you how to pour bottle conditioned beers, leaving the sediment behind...but it is easy to reduce the amount of sediment in the bottles...I talk about THAT there too.
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