rocknbil - 4:05 pm on Jun 24, 2011 (gmt 0)
Meta description is very important - if present it's what is used for the description blurb in the SERPS and can contain keywords. Make the unique and relevant to each page.
A more important question is did any of your URL's change? If so, did you 301 rewrite/redirect them accordingly?
Also it's not unusual for your site to drop out for a while after a massive change and come back up, sometimes better, after the mod. Wait it out.