I have just released a new hack for WordPress 1.3+.
Basically it allows you to delete all comments that match a certain set of variables, e.g. all comments from IP 127.0.0.1, with one click. You can find out more info and the download link over at my site, in the post entitled “Well anyway here is the hackâ€¦“.
It should be fairly straightforward to use, but as always you can leave any questions you have at my site.