Since the hiatus is going to last longer I'll post some sites I don't think have been mentioned yet.
http://slaverats.com - Rob Thomas's official site. It has a lot of interesting stuff for VM and his other work.
Mars Investigations -The (In)Complete Guide to Veronica Mars with character bios, ep guides, cast and crew interviews, music guides, a sort of VM encyclopedia, media mentions, and more. Really useful to help new fans catch up and fun for old fans too. This is the most obssesive site I've ever seen. It's really amazing.
Veroncia Mars Caps - Good source of good quality screencaps from every ep and it's not shipper/character biased like some sites and has kept up with the episodes more than some other sites that don't have the bias.
Television Without Pity - Television Without Pity is a site with hilarious recaps of tv shows. I've linked to the VM section. They can be critical and loving of a show.
Calixto posted a lot of good VM LJ communities on the first page so I'll post some new ones she didn't post
http://livejournal.com/community/vm_countdown/ - It was started as a countdown to the season premiere and has been started again to countdown to the next new episode. It has a lot of fun pictures and game stuff to help with the VM withdrawal
http://www.livejournal.com/community/vmrandom/ - It's for VM spam. If it has to do with Veroinca Mars and it's not an advertisment you can post it. There is some hilarious stuff there.
http://livejournal.com/community/fic_from_mars/ - It's new fic site that was made to have a place where good quality fic can be found. It's sort of like a VM fanfic literature magezine. A lot of good fanfic writers post their fics there first.
http://www.livejournal.com/community/tritons/ - any fanfic that's not shipping Logan/Veronica
http://www.livejournal.com/community/vmfanficutopia/ - A place for VM fic challenges that try to focus on all characters.
http://www.livejournal.com/community/rack_of_lamb/ - A community for Sherrif Lamb. Michael Muhney (the actor that plays Lamb) posts here.
I don't think AD is an insult to us. It does have a lot of crtical accliam and RT said he likes it. I kinda like it myself. Also a lot people probably felt that AD needed it more because there's already been a cancellation announcement. We could've been beaten by worse. Although I'm with you on Reunion.