An inner tube around the seat post and brake hoods will keep the front wheel straight while the bike's in the repair stand.
A electric motor field magnet holds screwdrivers, allen wrenches, etc. on the bench. I got one from a dead garbage disposer. (Idea stolen from bike co-op)
Colored tape on the most used (5mm) end of three way allen wrench speeds things up.
Cut off plastic vitamin bottles are handy to hold small parts- different sizes nest.
Friction tape still works good to build up tool handles, and is way less toxic than plasti-dip.
Small diamond files to sharpen screwdrivers, de-burr galled fasteners, flatten machined surfaces, etc.
Spray bottle with rubbing alcohol for general cleaning/degreasing, hand cleaning. Low toxicity