I don't know much about the Weblog awards for blogs, but this [edit:] is the second year they've included a "comic strip" category. The nominees are:
- Girl Genius – Phil and Kaja Foglio
- Day By Day – Chris Muir
- Extra Life – Scott Johnson
- PvP – Scott Kurtz
- Penny Arcade – Mike Krahulik and Jerry Holkins
- Attack – John Bergstrom
- Least I Could Do – Ryan Sohmer and Lar Desouza
- Sluggy Freelance – Pete Abrams
- xkcd – Randall Munroe
Basic Instructions – Scott Meyer
And here's a link to the full list of award nominees if you're interested.
UPDATE: I've gone ahead and fixed the list of nominees here to add the creators' names and webcomic URLs.
I have no idea about "Attack" though – please post a comment here if you know which comic the nomination is for. As noted in the comments below it appears that the "final nominees" are selected subjectively by someone(s) at the Weblog Awards (from a list of nominations by the public). Last year's winner – Least I Could Do plus Day by Day and Sluggy Freelance are all repeat nominees (they were on the 2006 list of final nominees). [I guess it's also somewhat interesting that both years two conservatively-slanted opinion comics have been included in the nomination list, but no progressively-slanted comics have been picked for inclusion.]