Which gets us to that old question of editorial integrity. Will Gizmodo have any? Will people trust it as a source of unbiased information when everything's for sale?
Conflict of interest note: We run something very similar to Gizmodo. And the guy who writes it gets paid (although it's only a small part of his job). And, yes, we plugged into Amazon.com for a Christmas gift guide last year.
If vertical weblogs is the idea, have a look at Corante..the best vertical weblog company, perhaps the only one there is.