I also began experimenting with sub domains yesterday, but I need to get another site hosted to really make it useful. I think that I'll probably use a sub domain for my advertising portion of my site. If you don't know what a sub domain is, it's a domain like my.yahoo.com, instead of www.yahoo.com.
The bad, well if you read my last post (which you probably didn't) you know how I feel about people compromising the integrity of google by these link exchange networks. I got an e-mail today from a site that is willing to link only to pages with at least a 5 rank on google and if you're lower than 5 you can pay for them to link to you. What a bunch of crap. This just completely undermines the Google system and should be banned. I struggle with my sites promotion, but I'd rather, get attention through hard work, not through link exchange.
Finally, I continue to do well in Tucson, AZ. Despite a recent post that all I ever get is restaurants, someone posted a Veterinary Clinic in Tucson: Central Animal Hospital. This was a particularly interesting addition because the adder put in the address phone number and web address. I guess maybe I'm not communicating the message clearly that all you need to add is the name of the business, probably because it's buried on an about page. I think I'll put a note about adding only the name on my homepage, but I'm not too sure.