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Let me breif you what is the problem. His Site was having PR-5 since last few years and was doing good for 2-3 words keywords. His site was having some 5,000 -6000 pages with unique content in product and category pages.
All of sudden he decide to increase his number of pages to build internal backlinks and get some good traffic as he has seen same technique followed by his competitor.
He has very practical issue with his category pages , as they were 100s of product in categories he has implemented pagination. Along with pagination he has also given sorting so that customer can sort by price,name,stock,popularity. Now problem he was facing was his page numbering and sorting were implemented through posback of Asp.net so when customer do sorting or go to next page the url remains same but data changes. Because of this if some customer bookmark 6th category page after sort by price and when they open from the bookmark they were not getting what they have bookmarked. so in order to solve this problem he has decide to create new page url for each of his sorting and page number criteria.
He implemented this new urls for page numbering and sorting in mid of dec 2006 and because of which his total number of pages increase from 6000 to 25000 - 30000. Not only he added sorting and numbering pages but in order to keep his page url very simple he changed his url pattern and he have implemented 301 redirect from the old url pattern to the new url.
Now google somehow seems to be not liking such sudden increase in pages in his site and his site was removed from most of the important keywords. after 26th Dec update.
He then again regain position for certain Keywords in SERPs on 15th jan and was again lost in 26th jan and He again appeared 13th Feb and is disappeared. He is very much frustrated and depressed. He has done nothing wrong but goole somehow doesnot like him keeping his customer's happy by adding few thousands of pages and also google donot like him changing his lengthy ugly URL pattern to short and simple url.
So what he was asking me is that should he take one step back and get rid of the sorting and pagenumbering urls and do 301 redirect to the actual category page. So that google can see that he has removed all suddenly increased url and he can again gain this position or should he wait for google next update.
Nextly he was asking that as he has changed the URL patterns his PR might not have transferred through out each page. All his category and product pages who were having good PR have not got PR transfered yet but his homepage is Still PR-5. So he was asking should he wait to get PR's transfered to NEW Urls from old urls (of which many pages were having PR-4& Pr-3 ). If he wait and if the PR's are transfered over than all pages will get importance and may come up again in SERPs.
So please you guys if you can help us in above to questions
1) Should he rollback newly added sorting and paging urls and do 301 redirect to actual category page or should he keep as it is as google will not count it as spam or sudden increase in thousands of pages
2)Should he wait for google to transfer PR's to new urls from old urls so that new url get importance and may help in pushing his site in SERPs for his imp keywords.
Both these features throw too many copies of the same information at the index.
Please if this is the only solution to save his site from dying then i will do that immediately or if any of you guys think that i should wait for 2 -3 weeks more .