Advent Calendar for Web Geeks

It seem like Advent Calendar are not just for promo only, it  can be something like tips & tutorials style,  these are some of the websites offer Advent Calendar for all the web geeks.

• 24 ways – web design and development articles and tutorials for advent
  
• PHP Advent 2010 – as title this is PHP based.
  
• Perl Advent Calendar 2010 – as title this Perl based.
  
• Performance Calendar – everything about web performance.
  
• Adfont Calendar 2010 – A free font every day from Fontdec.
  
• HTML5 Advent Calendar – 24 days of killer demos, tutorials, community buzz, and other stuff that Steve Jobs would love.
  
• 24 ways to start – The advent calendar for entrepreneurs
  

Do let me know if I miss out any, sharing with all the Web Geeks out there.