You could make your own ad that looks similar, links to other sites you've developed. Or you could put in a product from CommissionJunction, I suppose...
I've found that Google sometimes takes a while on new pages, but usually if I hit the refresh button a few times over the course of a few minutes, the PSAs disappear. For a brand new site, it takes longer, sometimes as much as a day.
I'd be careful about making ads that look too similar if you have more than one ad block on a page. It's a violation of Google policy:
this site softpedia.com uses google and intelli text so u say google ok with it? anyone any experience with above
I wouldn't waste your time on AlternateURL as an alternative. Been using them for a couple months now, and have gotten about 100 referral signups, too, but the payouts aren't worth having the ugly ads show up in my sites. Definitely roll your own alternate ads.
Here is a list of Adsense alternative. Hope it may help you. 1. AdBrite 2. Bidvertiser 3. Chitika 4. Infolinks 5. Pocket Cents 6. Kontera 7. Clicksor 8. Exit Junction 9. Yahoo Publisher Network 10. Fastclick