A couple of the most common time signatures are demonstrated through popular music examples from Incubus.
The odd time signature of 5/4 is demonstrated through beat division and an example from Radiohead.
The flowing time signature of 6/8 is portrayed through music from A Perfect Circle.
The odd time signature of 7/4 is demonstrated through beat division and an excerpt from Steve Vai's catalogue.
For those who want more, here's a glimpse of the progressive 9/8 meter.