I think these sound like perfectly fine speeds.
Wha you have to ask yourself: does my Mac do what I want it too as quickly as I need it done? The answer, for most people is yes. I want everyone to own a Mac so they can experience it, but its just fantasy. If you have a render farm, you're going to use wintell boxes clustered up. Everything has its proper use, and in the average to prosumer desktop market, a Mac will work better and more reliable no matter what the speed. Everyone complains about the pices, but no one considers the specs. Sure, you can get a $600 PC, but it has SDRAM not DDr, no firewire, CD-ROM instead of superdrive, etc, etc. It could go to 10ghz, the $600 machine is still an email station for all the good it dos you for pro work. Not to mention the clunky applications that drag the processor speeds dawn anyway.
Some of you out there have this wierd thing about being faster, bigger, better all the time. I don't know if you're 14 or you just have a complex, but please relax. If your mac does what you want and allows you to be more efficient, who cares how fast the clock is?
And the most important part: enjoying use. If you like using a Mac, (very important if you actually have to use one all day everyday, so that you and your ffamily can eat. If the Mac makes all of that easier, and dare I say it, fun, who cares about speed?