If you have a site that looses it's result from the 'info:' command in google, what does that typically mean? Will it come back? It is being reset? banned? One day it has results form the 'info:' command, and the next day it doesn't. What would you say is happening?
Could be banned... Maybe.. Did you copy content from other sites, or was it original content? If you've done nothing wrong, then don't worry. It will be back in a few days. Try to increase links pointing to your site. It will help increase your PageRank...
I don't think it's banned. Still has a few hundred pages that show up using a 'site:' command. Normally when a site is banned, you'll get no results using a .site:' command. Pagerank is 5, which is up from before the last update.
Check if your indexed pages number is decreasing or not and check if the G cache date rate is also dropping from once every 3 days to 6~10 days.