wyweb - 9:45 pm on May 25, 2010 (gmt 0)
Unobtrusive text links styled so it's obviously an ad.
Header. Footer. Anywhere it doesn't overwhelm the content.
If you have to.
That would be my preference.
In between posts?
Left side - right side - top or bottom?
I'd go top and bottom.
Sell them ourselves or use a network?
Roll your own. They'll be lining up halfway around the block to get some.
Set up your own.
Does it hurt our quality?
Not in my eyes it doesn't
Do you trust sites with advertising?
Just depends. I'd trust this one.