i just did a website redesign last week and i noticed a 50% drop of traffic since 2 days ago.. my adsense revenue dropped also without a doubt. from 50 to 20 per day. i did changes on all the main landing category pages (changes on the page names and putting them into a folder hierarchy structure). i did a 301 redirect on all the old pages to the new ones in their respective new folders. i redo my google xml sitemap and yahoo urlllist.txt to be resubmitted with all the new URLs and removing all the old ones. i also changed all the internal linkings to change to the new URL changed pages. All the changed pages are becoming more table-less and there is also a change in the text navigation css format (but still remains the same as text). when i checked my site statistics analysis report using hitslink, i found out that most of the traffic which i gotten were for google image searches and a few yahoo and msn of course. i know this is normal for a website redesign and hopefully my traffic will improve over time as i am thinking of long term impact. i wonder how long should i wait for my google traffic to be as what it were before the site redesign? anyone had any experience or idea? should i wait till next PR update or next 2 weeks or so? can it be months? also i noticed there is not just a drop in traffic for those changed pages but site wide traffic (meaning other pages rankings also dropped subsequently). this is really like a tsunami to me.... i hope its temporary. a word of advice and caution to all : better be prepared to face the significant drop in adsense revenue if you plan to redesign the website even after doing all the necessary actions (eg.301 etc...)
Just suffered from the same, it seems that it can take upto 2 months or so. But you never know with google ...
I did a redesign on a well-performing site in late 2006 and noticed no change in traffic until a couple of months into the new year 2007 when there was a noticeable drop-off in rankings & visits (about the same time as a PR update) Although the rankings didn't recover so well the traffic did; it was about 6 months before it reached its previous levels.
After 17 days of low traffic due to site redesign which virtually putting a crash to my adsense earnings , FINALLY..... today I have started seeing Google ranking high for my niche keywords and traffic has returned back to normal as before the site redesign was done.. phewww.. Cheers to you Google...