Should be as quick as google re-crawls the robots.txt.

Best thing you can do is add a couple of links to sites that are crawled daily, to encourage google to visit your clients site as soon as possible

Could be:

• twitter
• facebook
• newspaper sites - comments
• and the like

Panda is probably the worst penalty to have. Very few site ever recover, even though site owner have spent a lot of time, effort and money trying to solve it. e.g. http://searchengineland.com/google-panda-two-years-later-losers-still-losing-one-real-recovery-149491

In this video, about 12.43 - matt cutts is clear, if you think its low quality 404 it, in other delete it.

May I ask why you want to keep these 180,000 pages live? And why are you planning to add another 100,000 pages? Surely they cant be high quality pages?

Thanks Lily.

Redirecting old sites is unlikely to give you a rankings boost, especially if they have changed hands and have expired / dropped. You really need to buy them before they expire and don't change two many details.

Think about seomoz.com to moz.com - all the link juice have been transfered, and so it should, its just a rebrand, same servers, so owners, etc. But if they brought so ramdon site and redirect do they deserve the link juice? No, and google doesn't think so either.

What are you trying to achieve by buying dropped domains? Are you planning to redirect them to your own sites for link juice? If you do that be very careful, there are lot better ways to get link juice.

To check a domain I would:

• search on google for the website name, e.g. "seomoz" does it rank? (doesnt too much if it doesnt the keyword might be competitive)
• search for the url, e.g. seomoz.com if it doesnt rank number 1 for this i would walk away
• does it have sitelinks under the domain name, if yes thats a good sign
• grab some text from the site and search for it (ensure you are using a clear browser, e.g. no cookie history, so personalised search doesn't kick in), if its a couple of sentences it should rank for that
• grab a few meta titles and search for them, if they dont rank for the complete title there could be a problem
• does the site have page rank - a red flag if it doesnt
• ask the site owner for the last years analytics traffic, the overall traffic graph would be fine
• look at its moz rank, does it seem to match how it ranks, e.g. if very high moz rank but not ranking for the site name there could be a problem

that should do it.

How many people search for "no1 android phone"? No many, so why put it in your title?

I would do some keyword research and target those terms.