Best web tracker(s)

What do people here use for web trackers?

I’d like something that is easy to use - just drop a little HTML in my footer and good to go.

It should have:
Good graphing traffic over various time lengths
Good tools for looking at search-generated traffic (keywords and such)
Ability to see which individuals pages on my site(s) have the most traffic
Good analysis of referrers
If possible, ability to see which of my URLs (I have a few pointing to my site(s)) are drawing the hits.

Free trackers are nice, but I’d also be willing to pay a bit, too.

I’m not too big on just a stats package for my log files, unless it’s really easy to use. The ones my ISPs provide are like wading through mud.