This depends completely on what type of connection *you* are using.
If you're on a 56k dial-up modem, then times in the 200-300ms are quite normal.
If you're on a DSL or T1, then times <100ms are to be expected.
If your running your pings off a server connected via network to a T3 (i.e. using a service like tracert.com or one of the others), then <50-60ms are to be expected.
A traceroute is normally a much better indicator of performance than a ping. A ping will show you only the round-trip time, without indicating where the slowness is actually occuring. A traceroute will show you all of the "hops" between you and the web site - that way you can see if the problem is in a backbone or even your own ISP rather than at the web host hosting the site (which is often the case).
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