Titanium bolts: Preventing bonding? I picked up Ti bolts for my [brake] rotors, and am aware of TiPrep but wondered what other more commonly found (and likely cheaper) alternatives are there?  

Scouring the 'Net, I've read about copper anti-seize...  One co-worker who does auto-moto stuff suggested zinc anti-seize?  Loctite in general doesn't appear to be recommended, though they do have a copper based product.
You use the anti-seize compounds on bolts where you would normally use grease. For rotor bolts, use an ample amount of blue threadlocker (loc-tite), even on Ti bolts. It acts as a sufficient barrier between the two pieces of metal and prevents oxidation and bonding. I've done this on others' bikes as well as my own with no instances of bonding to report. You don't want your rotor bolts backing out and anti-seize compounds are not suited to prevent that from happening.