Looks like the MEGA link for the drivers was cut off due to the way XDA truncates links.
Try this: https://mega.co.nz/#!tJdHCIAT!agSun8Wa1tOx_3tL8YMuS19j1i5wWG2WUJPprmTbTCs
or load the link from the first post of the Air 3G thread.
Go to the dialer and enter *#*#7378423#*#* and go to Service Info -> SIM lock. The bottom line should say SIM 0 if it's unlocked. As for why it wasn't showing the bootloader status, I don't know. I was having the same problem yesterday, on multipl...
SIM unlock and bootloader unlock are two very different things, as you've probably found out by now; the r800at models can't be bootloader-unlocked with the free Sony method; you're going to have to pay someone, and it'll cost you at least $20. If...
What was the point of bumping this? 3.2 is outdated, and you can always find the latest version at the Unrevoked site.