I'm positive some of you out there use this application for a great deal of things and I'm pretty glad myself to see that it has been updated for the BlackBerry Bold. Yahoo!Go is what I would refer to as an "integration application" as it wants to be your one stop shop for everything and pulls it off quite nicely after many upgrades to how it functions.
Boasting what Yahoo calls "widgets" you can access a ton of things all from one central location. News, Ebay, Facebook, Flickr and even Myspace can be accessed from within Yahoo!Go. So while RIM offers similar services to some of this stuff, Yahoo!Go takes it and integrates it into one application.
If you have tried Yahoo!Go before and were not really fond of it, give it a whirl again... you may come away pleasantly surprised with the appl this time around. And at $0 the price is right!
* A little bit of a warning though for those who may be on *limited* data plans - the download does roll in at just a little over 1MB *