I'm intrigued by Microsoft's forthcoming Popfly service. Mary Jo Foley explains the details here. I've looked at Yahoo Pipes at least twice before and never found enough time to get up-to-speed on it. If Popfly really delivers on the promise of "Pipes for the rest of us", I'm sure I'll be hooked.
I just submitted my alpha request and will patiently wait to gain access. Stay tuned for future posts on my Popfly experience and what benefits I find with the service...