Actually, now I think I'm going to have to change my mind: I just destroyed ~2 bitcoins by not backing up my wallet when I reinstalled Linux (for the ~10th time) to add a 4th GPU to my rig. Inflate those bitcoins back!!!
More seriously, though, if the actual number/value of bitcoins in circulation becomes a problem for being too low, someone can start another currency with the same protocol. So long as they can achieve the same network affects, the coins will have comparable value and increase the effective "crypto-money supply".
That's true. I haven't thought extensively about the economics of competing currencies, so I'm not sure what effects this would have.
Though not yet an "official" project, Google has released a Bitcoin client. As you may remember, there were concerns here about what the government/legal reaction to Bitcoin [1] will be, and the significance of certain groups lending their support to it. EFF and SIAI accept Bitcoin donations, which helps, and this action by Google is another big step.
Previous articles: SIAI accepting Bitcoin donations, Discussion on making money with Bitcoin (Clippy warning on the latter)
[1] In short, it's an anonymous P2P crypto-currency with no transaction fees, in which new units are generated by spending computer cycles computing hashes until you find one with specific properties.