Digsby is my goto application for instant messaging, email, and social networking notifications. It's an application that has gone through it's good reviews and bad, and has rightfully deserved the bad reviews when it got them. However, today it is a great IM application with a clean install. Just pay attention as you go through the install process and uncheck anything unnecessary.
What Will It Do For You?
Digsby excels at two things, bringing all of the aforementioned services together into one application in a visually appealing way, and only making you do it once because it will sync across all of your computers automatically.
All of your IM accounts (Facebook, AIM, Gmail, Yahoo, MSN Messenger, etc) can all be added to this one application. This is nothing new, but Digsby does it well and it is half of the reason I use the app. Each new chat you have open can be contained within one chat window and the conversations are separated by tabs. There are many chat features, but nothing worth mentioning. It's all done well here.
If you're like me, you like to use a webmail interface to access your email instead of a desktop application like Outlook. One of the biggest disadvantages to this approach is that you don't get pop up notifications or have any other way to quickly identify if you have an email that needs to be addressed without logging into the website. With Digsby, it will not only pop up little notifications upon new email arrivial, but it keeps it in a handy interface to quickly look them over and even interact with them such as archiving, spamming, or deleting them straight from Digsby. I currently manage 4 email accounts through Digsby and find it very effective.
Just like with your email, Digsby will pop up little notifications when something happens at a social network like Facebook or Twitter. It will also let you interact with those networks in very useful ways. In your Facebook feed on Digsby, you can leave comments, "like" things, and also view larger versions of pictures without ever leaving the application. It's truly one of the main ways I'm able to keep up with these things at all because of the limited amount of day time I have to spend on these sites.
All in all, I highly recommend Digsby as an IM client more. It's become an essential part of my work day and almost the sole way I interact with Twitter.
Please let me know if you have any questions about the app and your opinion on it if you've given it a try.