Regarding my last entry, having more than 3x outgoing as incoming is OK, you still get the boost, but obviously the outgoing value is split among all of your outgoing links. One blog I know has over 8x as many outgoing as incoming, and is still seeing the boost.
A rough formula: Outgoing Value * # of Outgoing Links / Blog Value. If you're not hitting the sweet spot, this value will be close to 1. If you're hitting it, it will be something around 5-8, depending on the exact ratio of links.