Redundant AS's

[Simon Brilus]

Out of interest, is there a report that details the number of unused older 
AS's in the Internet and what is being done to recover them to recycle, as 
we approach the 53k mark and the 32 bit numbering scheme, it strikes me that 
we probably have a lot of stagnant AS's out there due to takeovers etc..

Any thoughts?
Simon