More tech toys to play with: Stumbleupon & Furl

From Mark Graham and Chris Alden come mentions of stumbleupon.com, a service that signs you up then asks you to download a toolbar onto your desktop so you can share cook sites and links with your friends, and furl.net, a service that allows you to share feeds headlines with designated friends.
The stumbleupon about page says: Founded 2 years ago, Stumbleupon has developed a patent-pending community-based websurfing system which now supports over 70,000 members. Our goal is to build an emergent media referral system which automatically matches the right people to the right content.”
Furl says it is “an online filing cabinet.” I haven’t really used it yet, but plan to fool around with both in the next few days.