I've spoken at a few online and community events recently and have been really disappointed by the amount of people who had heard of SPDisposeCheck. This tool should be the first thing installed on a Development machine after installing Visual Studio 2008/10.
I have also spoke to a few people who have attended SharePoint Development courses and have been really disappointed to hear that this tool is not recommended or mentioned. It is a great way to learn what code needs disposing of from the SharePoint Object model. There are plenty of exceptions to the rule out there and unless you keep a printed reference by your desk you're unlikely to remember them all.
So, just follow my 5 min demo on @SPDevWiki and you'll have no more excuses and neither will your team members! Kudos to StephenVDick and Matt Ranlett for putting this add-on for VS2010 up on CodePlex! The SharePoint Community simply rocks!