Yeah, sorry for not adding this above, but I did know that 2Gb a day is *possible*, I just think it's likely something is going wrong. We've had MSNbot and Googlebot go into loops or semi-loops on some sites here, so I'm suspecting something like that. It could also be referrer spam, or any one of a number of things. He specifically didn't mention it was a very high traffic site, so if it's not (and he'd know as it usually builds up over time), my bet is there'll be a culprit! Unless it was slashdotted! Anyway ... all theory until the OP responds ...
- b