I had a lot of blogs kicked out of Google for using descriptions as they were - I mean the blogs are still listed but get zero Google traffic (and the picture was different a few years ago).
One (sweet and lazy) way around this is to replace words with synonymous, but I would advise you to also randomize your entries well. Say you have a database of url|descr|thumb from at least 5-6 different sponsors, first randomize the entries, replace crapload of words with their synonymous (description field only) and then use them in your sites or blogs.
PS If this didn't make sense to any of you, don't sweat it ;)
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