Robert_Charlton - 2:35 am on Aug 17, 2010 (gmt 0)
its 10 links
10 global nav links with natural and varied vocabulary are extremely unlikely to cause any kind of penalty. For discussion on what is causing penalties these days, see this current thread....
Possible Causes of Google Penalties
The idea of monitoring your serps and boosting pages you'd like to boost makes some sense, but you might also want to consider whether 10 particular pages are worth boosting in terms of potential traffic.
Keep in mind that adding links to your home page or global navigation redistributes the flow of link juice, dividing it up into more channels or branches. So each link you add to your global navigation reduces the flow to existing nav links, perhaps giving a single page as much prominence as a category with a dozen articles.
It's up to you to decide whether the new links you're adding warrant the extra share of user and search engine attention they'll be getting by being featured globally.