I initially thought that too, but dropped that thought very quickly after some deeper thinking. If three syllables is too many, than the only options are one and two syllable names. One syllable is damn near impossible to achieve, leaving two syllable names as my only option. Sure, plenty of the big guys have two syllable names (yahoo, Google, Facebook, twitter) but these are difficult to find/register, and there are just as many websites and growing startups with three syllable names (posterous, delicious, amazon, etc).

So I'm sure I'd be okay with a three syllable name, but I think I can gather the creativity to come up with a two syllable name.

Edit: on second thought (or third?) I'm sure I can muster up even more creativity for a one syllable name. Looking at others helps.