I'm starting to get the hang of it.
I just keep repeating to my self that Google knows best. ;)
And for the real world. I'm trying to cover as many matches in my keywords that I can.
big widgets
small widgets
big blue widgets
small blue widgets
It's a real pain, but that's what Google wants, so that's what Google gets. :(
Sorry if this doesn't make sense. it does in my head, but i was out on the drink last night and still feel a bit on the rough side.
if you read this [webmasterworld.com...] i explain why the ad may not show, but written when i was in good mind.
hope this helps