The PS3's game library is comparable to where X360's was at this point in its life.
(6 months after release)
Of course at this point in time (early 2007) the # of good X360 games available is further along due to an earlier release. IMO the depth of their respective game libraries will likely be tied by the end of next year.
When someone is asking what console to buy *now*, saying "yeah, but xbox didn't have a lot of games either a year and a half ago" isn't very helpful.