Kol Spoilers - for all of your spoilerish needs, or mostly all of them.

Item Effects - this site actually is a log of consumable effects. Its quite useful, thanks Ohayou.

Item Helper - This site has a list of every item in kol, where you can find it, and what you can make using it.

Visual Kol - A colourful representation of combining recipes, item effects, and lots of other little things. KOL

Coldfront - Its best feature is the market, which looks like a mock stock market. Its really helpful for keeping track of item prices, mall trends and such. It also has a bittorrent download for the recording of the Jick and Skully show, and a weekly magazine.

KoL Forums - The official Kol forums, a good place to go for unspoilerish help, contests, and general kolness.

buffbots - helpful little programs, this is linked from Subjunctive Kol .