On the FB page and on VVO, have a picture of the day post every day.
I know shit like this is not your forte, Cris, but get someone to be PR and do it for you.
You want eyes on Snapzilla as much and as often as you can.
Many ppl are looking for alternatives to Flickr right now and this might just be your chance.
marketing is key..especially with flickr paranoia...you'll want people to know that there is an alternative in case of collapase.. a few key bloggers could just suggest it and traffic will start comming your way. they will also start throwing suggestions at you( probably to make it look more like flickr ).
Edit: i just logged into my snapzilla account first created in 2009... i feel old.
Really spam the slpics address on the site so it's obvious how to do it. Like have every image that was posted from Second Life that way say something like "Posted from Second Life by mailing the snapshot directly to firstname.lastname@example.org".
Edit: I tried to make the email address not a link, but it turned back into a link when posting.