Various links I consider worth collecting for whatever reason.

• Tutorial about programming ATtiny. http://metku.net/index.html?path=articles/microcontroller-part-1/index_eng
• Website for company who can make low-volume PCBs. http://www.batchpcb.com
• A page showing how to set up Texlipse and SumatraPDF to work nicely together. http://forums.fofou.org/sumatrapdf/topic?id=9742
• An online LaTeX image generator http://rogercortesi.com/eqn/index.php
• An improvement to twitter http://www.aaatos.net/shutup-er/