Bulk tagging

I've got about 500 product nodes that I'd like to tag.

I've also got a list of tag terms in taxonomy - ideally I'd like to have drupal autotag these products based on the body content of the node. I've looked at the autotag module, but it's for version 5. Is there something similar I can use for version 6?

Failing that, is there a way I can bulk edit a bunch of nodes? It'd be nice if I could mark all the nodes I want (check off checkboxes for example), add some tags, and have those tags applied to all of the checked boxes.

Any other clever solutions (some sort of firefox/greasemonkey magic perhaps?) would be useful, too.

Thanks.