Here’s a quick breakdown of how many A5 owners have jailbroken their devices since Friday morning.  The numbers as of Monday afternoon are:

• 491,325 new iPhone4,1 devices
• 308,967 new iPad2 devices
• 152,940 previously jailbroken (at 4.x) iPad2 devices

Total: 953,232 new A5 jailbreaks in a little over 3 days

The reason these numbers can be so precise is that one of the housekeeping activities that happens when you launch Cydia is a query to @saurik’s server for the list of available SHSH blobs.  (Even if you have none on file, the query is still made).

Welcome to the jailbreak family!

P.S. Remember the cardinal rule of jailbreaking: never update your firmware until a new jailbreak is available.  This is especially true for A5 owners, who currently have no way of restoring to 5.0.1 once the 5.0.1 SHSH blob signing window is closed.