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When Website-hoster Rackspace went down last fall, 37signals, the maker of Web-based collaboration software called the calamity a "perfect storm" and said it "will be using this situation as both a wake-up call and a learning experience." Well, somebody hit the snooze button. 37signals' suite of software services are down , leaving many of the Valley's startups — Valleywag included — without crucial collaboration as the day begins. Anybody up for making it a four-day weekend? Update: Darn. 37signals is back up. Do I still have to work?