A query posted on WebmasterWorld thread inquires about the way to preserve PageRank value one has on the pages without spreading it out too much.
The query is:
I have around 60 links to my other pages from my home page. Is that too much, will that cause my PR to leak? Also I need to ask you what about linking to other sites from home page, will that cause the PR to leak?
Though this thought occurs to many a webmasters, however, so much of focus primarily on the PageRank is also not advisable. Think about the users for a moment… sixty links will turn off the users for sure.
Adam Lasnik, a Googler replies to the query:
I wouldn't be particularly concerned about "PR leakage." It's more important to make sure that you aren't engaging in link schemes designed to manipulate your site's ranking.
Many top-quality sites feature quite a few (quality) outgoing links, and are appreciated for that by visitors.
In other words by concentrating on PageRank dilution one would actually be manipulating the site rankings.
Search Engine Roundtable has a good post on it.