Mashable’s 3rd annual Open Web Awards online competition is All you need to do is login and vote. You can vote once every day up until 15th November 2009. Mashable has also provided a way to generate your own code to embed into your website, blog, etc. Categories and details are:

Brand / Startup / Company / Agency
Best Brand Use of Facebook
Best Brand Use of YouTube
Best Non-Profit Use of Social Media
Social Media Agency
Best Brand Use of Twitter
Best Corporate Blog
Social Media Ad Campaign
Social Media Gadget

Facebook
Best Facebook App
Best Facebook Game
Best Facebook Fan Page
Most Creative Use of Facebook Connect

Media
Best Breaking News Site
Best Local News Site
Best Online Music Label
Best Political News Site
Best Site for Publishers
Best Local Blog (we love Lichfield Blog and have been voting for them)
Best Online Magazine
Best Online Newspaper
Best Site for Journalists
Best TV Network Online

Mobile
Best Location Based Mobile App
Best Mobile Based Twitter App
Best Mobile Music Site or App
Best Social Network iPhone App
Best Mobile App
Best Mobile Game
Best Mobile Travel Site or App

People
Best Actor / Actress to Follow
Best Celebrity to Follow
Best Social Media Maven to Follow
Most Educational to Follow
Best Blogger to Follow
Best Musical Artist to Follow
Funniest Person to Follow
Most Inspiring to Follow

Photos and Videos
Best Flickr Photographer
Best YouTube Channel or Personality
Funniest YouTube Channel
YouTube Video of the Year
Best Online Video Web Series
Flickr Photo of the Year
TwitPick of the Year

Twitter Specific
Best News Source to Follow
Funniest Tweet
Tweet of the Year
Best Twitter App
Most Interesting Twitter User to Follow
Twitter User of the Year

Login and nominate at http://mashable.com/owa