On older PCs, or simply if you don't like wasting computer resources, you might have thought about how bad it is to have MSN Live Messenger, Google Talk, and Aol Instant Messenger running at the same time. I'm testing the some all-in-one messengers, and the first in my list is called Digsby , which promises not only gather many IM services interfaces together with e-mail and social networks like facebook and myspace . As far as CPU resources go, Digsby seems to be quite friendly. I haven't really tested his webcam or voice transmitting capabilities (yes, supposedly it works cross-client too). However, memory usage varies greatly ranging from an acceptable 12MB to up to 60MB. I expect this to vary based on the skins and features you're currently using. Right now, I've minimized Digsby, and it's using between 17MB and 20MB, which is quite acceptable. For comparison, if I close Digsby and start Google Talk and Windows Live Messenger, CPU usage is also very s...