@Ben
the credit score change all depends on many factors. It's going to hurt the score but it depends on your overall credit line availability and utilization ratio. Say you have $200k total credit line available and you have no other significant balance, maxing out on 1 card for $10K balance isn't going to make any much difference.
As Joseph mentioned above, I recently took advantage of a BofA card that has intro 0% balance transfer fee and transferred about $45000 worth of dept there. I have sizable credit card debt that I've been floating on number of credit cards with 0% APR but have been paying between 1-3% fee as I find that cheaper than getting a home equity loan (no I am not in a financial trouble as I could easily pay this off but I decided to invest in stock instead and did pretty well over the years)
$45000 balance transfer at 3% would have been $1350 in fee so I essentially got one of the most lucrative signing bonus on a card that didn't have any signing bonus and without any spending!