At one point Google did say in their guidelines to keep links down to 100 or less but they have removed that. Even Matt Cutts (Google Spam Dept) refers to this now removed line in his post How many links per page?
What would be more important is the usability of your pages. If you have a ton of links on a page it can be very confusing to the visitor.
There is also the consideration of getting the right balance between the number of links on a page and actual content so your page(s) don't look like a link farm page.
Linking out is good! Having links out to reputable related websites as a resource or as a confirmation of what you have said on the page adds to your reputation as a valuable resource. Hey, it might even get you an incoming link from the site, an interview or something else that benefits your business/website.
Are You Linking Out? You Should Be
We all want our sites to be popular, the hub of your chosen niche. You do this by providing valuable information that people want to link to.