"As of October 2012 (block 203258) there have been 7,979,231 transactions, however the size of the unspent output set is less than 100MiB"
You need to back this up, because from what I recall estimates were between 70-80% of the current block chain's size, which, even today, is definitely not 100MB.
You probably recall the correct percentages (70-80%) but that's the percentage of
spent outputs, which could be forgotten.
I can confirm the following around block 202287 (using my BiRD client which only keeps track of unspent transactions):
- 2443854 unspent transaction outputs, which is about 30% of all transactions (see 7.9M txs at block 203258)
- the MySQL database containing all the necessary data to be able to spent those outputs, i.e. creating a valid (unsigned) tx, is about 316Mb in size when converted to an uncompressed CSV dump (simple text file)
- compressing this CSV file yields only 110Mb of data.
You can download the client and some CSV's
here.