Personally I sue skype for business purposes because it's more dependable than yahoo messenger.I do use yahoo.messenger for casual talks with friends.
I use it very often
I use Skype but I have very few contacts in there compared to my 400+ contact list on MSN.
But if you compare video and audio quality to MSN then Skype is way better imo.
I use Skype a lot because it has this unlimited world connection where you pay a flat rate of $12 a month and you can call landlines (and even handphones in some countries) without limit. It's also great for chatting and voice conference if the internet connection is fast enough.
I use it for both work and personal stuff.
I do use it from time to time to talk to some of the people I know outside Belgium. Most of the time it's still MSN though
My edit team is spread across several continents. It'd be wasteful to pay long distance charges when we can speak skype-to-skype for free and we can see who is available online at a glance. Plus we can use it either as a phone, video phone, or text medium, and we can conference if needed.
As a practical matter a lot of people like varied communication programs, so I have Trillian open on the desktop when I'm online, and use it to combine skype, aim, yahoo messenger, etc. They can all be used thru the Trillian interface, so I only have one platform visible that way but can still use multiple mediums.
Till now i haven't used skype.
i think it's very easy in use and convenient