Thinking back on things, I probably had some Instawallets that I experimented with and forgot about with tiny sums, or with what were tiny sums when the price was in the single digits. I don't suppose that Bitcoin-Central will tell us what their take was from unclaimed wallets. Hopefully they will at least be good guys and distribute such proceeds to the large wallet holders which they may or may not be able to make whole.
About the time Instawallet went down I found a stash in a plain old wallet file in the multiple hundreds (of BTC) which I had forgotten about. A nice little surprise, and indicative of how us 'old timers' can lose track of what can eventually become a noticeable amount of value. Thankfully I'd 'cleaned out' my Bitcoinica account before those guys took their pay-day, but I still had 2 or 3 BTC there. At $5/BTC it wasn't a big deal but now it kind of irks me a bit that ~vess or whoever has several hundred dollars which they stole from me.
Again, I hope that when the dust settles, Bitcoin-Central can find the time to issue a credible report on all of the happenings and it would go some distance toward demonstrating that they are, on some level at least, trustworthy.
I had a wallet that I lost he URL of last year with 200btc in. At the time it was worth £600 and I just wrote it off as the warning about losing the urls was very clear.
For the record I also had an instawallet account that I lost the link to at least one year ago which definitely contained around $500usd worth of btc at the time (my computer froze before I could save the link to a text file)... many lessons have been learned the hard way over the past couple of years.