A few days ago a new webapp hit the streets. FeedCrier claims to keep you instantly alerted to any news from any feed you subscribe to using their service. It’s essentially a new feed reader that sends new items directly to your instant messenger account.
If you subscribe to a lot of feeds like I do I wouldn’t suggest putting all of them into FeedCrier but it is great for those few that you want to get immediate updates for.
A great thing about the site is there’s no account required. Simply provide your Messenger account (MSN, Jabber and AIM are all currently supported) and the feed’s URL.
Initially I was very cautious because I saw no mechanism for unsubscribing or maintaining your subscriptions. Luckily they explain it all here.