This is McCain's most recent FEC report, listing his cash on hand as of 1/31/08. He has roughly 5.2M in cash, and 5.5M of debt.
I'm sure he's brought in something since he secured the nomination, but he really is starting from scratch. And unless I missed it, I haven't seen any stories on the massive influx of online or establishment money to McCain. It'll happen eventually I'm sure, but it's worth noting that the campaign hasn't been bragging about it as of yet.