Guys I found this really cool free tool called Blog Talk Monitor created by Jack Humphrey. It allows you to receive instant updates on the BREAKING NEWS in your niche, so it gives you very good ideas on creating content. You can also get info straight from relevant blogs in your niche, and it makes it very easy for you to comment on blogs and build links (just need to make sure dofollow). I don't know the creator of this tool. Just thought it might be useful to everyone.
You can set-up Google Alerts also which is a great tool to get updates on certain keywords, niches, etc.
Why don't you simply use google alerts and google news alerts The concept is good and others have tried such 'Memes' before.
Or you can just read the RSS of all related blogs in your niche. This will give you a bunch of ideas for new articles and you can comment as well.
I do what zexy does and have a separate email for RSS. A couple of times a week I go see what's crackin' and start commenting. Check out Blogger Central. If you have multiple sites you can find blogs to comment on. Blog Talk Monitor sounds interesting.