It's the echo chamber's busiest week of the year. Chris Shipley kicked off the Demo startup conference on Sunday in San Diego. Michael Arrington and Jason Calacanis have amassed an army for TechCrunch20 TechCrunch40 TechCrunch50. We're curious: Which one are you going to, and why? Tell us in the comments. One prominent tech blogger told Valleywag he's splitting his time between the two shows because he doesn't want to offend either Shipley or Arrington.

No such dilemma for cam queen Shira Lazar, a Los Angeles TV personality and Seesmic comment diva who's been shamelessly flirting with Arrington in public, online, for months. Lazar has landed in San Francisco for the TechCrunch show. Here's a video showing her having to deal with Michael Arrington and preparing for the big TechCrunchOrgy. You can stop watching after she mockingly tells Arrington how great he is, unless you're really into watching Lazar pick out her wardrobe.

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