09-23-2004 12:23
Check out http://secondlife.com/land/ for data about actual in-world sales. This information covers the previous seven days and will be updated daily. Current stats are:
Parcels Sold: 1,686
Total Square Meters Sold: 1,888,960
Average Parcel Size: 1,120
Average L$/Meter Paid: L$ 5.04
Median L$/Meter Paid: L$ 4.00

For land data going back a few weeks and wider economic data check this post.