Google PageRank: Frequently Asked Questions - Do low level PageRanks help my website's PR?
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All incoming links count towards your total, but lower level PRs (0-3) don't count for much of that total immediately. They will probably add more PR later, however, as their own PRs increase, making all inbound links valuable. Keep in mind that theme relevant links from theme related pages provide more power in Google and the other search engines than unrelated higher PageRank links. Always remember that PageRank is only one factor in the search algorithm.
Should I exchange links with low value PageRank pages?
PageRank should not be your primary concern for link exchanges. Benefits to your readers of discovering new and interesting blogs and websites should be your first concern. The PR is simply an added bonus, and the PR may rise over time. A PR2 could soon be a PR7.
Can a lower PageRank page drain and reduce my PageRank?
Lower PageRank pages don’t reverse or drain PageRank. The flow is always one way, from the sending to the receiving page. Linking to a lower PR page won’t lower your own PageRank. An exchange between two theme relevant pages might even raise each other’s PageRank. Google’s linking system, in its most basic form, is designed to reward linking to other sites, but not for establishing artificial linking schemes to trick the search algorithm.
Are 60 outgoing links to another Web page too many?
No, as Google is only concerned with pages of over 100 outgoing links. Google considers overly linked pages to be link farms, and they are penalized as such. Your site will not a experience a problem, although each page linked to your page will receive only very small amounts of PR flow.
Google Optimization 
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