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Thank you Mike, Very appreaciated

Url? It happens when majority of the backlinks point to the Home page and are not evenly distributed throughout the website.

The short answer is "no". There's no safe way (i.e. that doesn't look like cloaking) to NOINDEX just a few links, and nofollow doesn't work for internal PR-sculpting anymore. When you're talking about something like an archive - a long list of resources - I wouldn't get too hung up on it. It's really an issue of balance. If every page on your site has 200 navigation links, you're spreading yourself really thin. If one page of your site references 100 blog posts in a list, that's pretty natural. You could paginate that list and use rel=prev/next or something like that, but there's always a trade-off (the first page would probably pass more PR and the later pages less). The other option would be to have two archives - A Top 25/50/etc. that has the posts you most want to pass internal PR to, and then link that to an archive with everything. That would give the main posts more prominence. Always a bit hard to say without seeing the site/page, but in this case, I don't think I'd lose sleep over it.

Thank you Alex, Great answer. Cheers, David

Thank you Egol. Your insights were very helpful. David

Thank you Peter. I appreciate your useful feedback.

Lets say you have ugly url page.aspx/param=value the ugly url works it renders a page using the parmeters in the url. having a pretty url rewite to the ugly url will still renders the page the same way. but then you have both the pretty url and the ugly url that can render the page casing a cononical issue, so you much 301 the ugly url to the pretty url See url rewiting half ay down the page http://www.seomoz.org/ugc/microsoft-technologies-and-seo-web-development