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No problems with either my iMac or MacBook.

iMac
  • 802.11g
  • Connected to Airport Extreme (802.11g)

MacBook
  • 802.11g
  • Connected to multiple Airport Extremes at school (all 802.11g) or Airport Expresses (both 802.11g) or cheap Netgear routers (802.11g)

edit:
I am one of those people who detest the WRT54G! There are three at my church where I act as somewhat of an IT person and they are a huge pain... iChat video/audio? Ha! Fat chance!
 
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