Ritalin

“Oh... and whats a really good book for bike mechanics?”

The term “good” could vary widely depending upon your level of comfort with general mechanical skills and appreciation of mechanical engineering. Be what it may, I would suggest starting with several outstanding Web Sites on the subject:

http://www.parktool.com/repair_help/FAQindex.shtml
Excellent guidance on Bike Repair and Maintenance:

http://www.sheldonbrown.com/repair/
Much wisdom, from a gifted communicator. The Site’s author; Sheldon Brown in the 1980s, wrote a regular monthly column in “Bicycling” magazine, on maintenance and repair

I trust that this is a "good" starting point of merit.