I'd guess that they haven't received the confirmation from Google checkout. I know you have, but it could be either be a communication problem between Google Checkout and DreamHost or it could be some other internal validation that Google Checkout has to do before they submit the final approval to DreamHost.
Regarding why support is taking a while, it's probably because it's not technical support that's handling this - it's probably account activation or accounting's responsibility. I dunno if tickets are routed to the right people automatically or if this is done manually. It could be that they're getting good response from their 555 promo and are just a little slower in getting through the queues.
I know you're very excited to begin building your site, but I sometimes like to be patient and wait for the automated systems to process because there's less chance of human error. I remember seeing posts from people who's payment situation has gotten mixed up by too much human intervention. Anyway, I'm not advising you of anything, just mentioning what's worked for me.
Finally, we should all remember that there's only so much human intervention that we can expect at the prices we're being charged. The key to DreamHost being a low cost provider is their ability to keep costs down. Manually expedited processing costs money.
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