It has been a common link building principle that people prefer to have links from pages having lesser number of outbound links and one key reason that is sighted by most people is that more outbound links results in minimal passing of PR value.
In a recent post Matt Cutts clears Google's standing on this issue. As a general design and content principle under Google Webmaster Guidelines they have always stated that a page should not have more than 100 oubound links. Matt further explains now that, there are multiple reasons for this..
a) Google originally could index only 100 KB of a webpage and pages with higher nuber of links had a risk of not being indexed properly. However, now Google is far more capable and can index pages properly.
b) Now the main concern about having more number of links is user experience. Generally users don't prefer web pages with tons of links in them.
c) Last but not the least a page with too many links can pass only a very miniscule amount of PageRank to each of them, thereby the sites are not really benefited to great extent.
However, Matt has also clarified that having large number of links doesn't necessarily tell Google that the page is spam, however, this is a common indication that Google finds in spammy pages.
After reading this now you must be knowing where exactly should you be putting links to other pages and which pages would be good or you to get links from. In case you want to read the original post by Matt here it is.