Not too many. If they don't I just use Dapper, and then Yahoo Pipes if needed. Amazing "hack" about Yahoo Pipes... they block usage based on an IP accessing a

Not too many. If they don't I just use Dapper, and then Yahoo Pipes if needed. Amazing "hack" about Yahoo Pipes... they block usage based on an IP accessing a pipe. Yet, you can make that pipe access the "singleton" version of itself many times. So let's say you want to pull up Delicious tags of 10,000 URLs (something I did to generate very nice marketing data), you could access Delicious yourself 10,000 times (and get blocked very soon) or you can access a pipe (which accesses Delicious) 10,000 times... or you can access a pipe 100 times, each time sending it 100 URLs, and that pipe will just loop through and do it (Yahoo will count 1 access against you rather than 100). Since there are loads of pipes servers, and it's a semi-trusted source (in this case very trusted, since Yahoo owns Delicious), not all the Yahoo pipes servers will get blocked by Delicious. Actually, at the rate I was pinging them, some of them did actually get blocked :) Another interesting experiment: Make a Dapper App which contacts Yahoo Pipes for an RSS. Make that Yahoo Pipe access the same Dapper App. Fun!