I'm not sure if everyone knows that, or even if it had been discussed before, but anyways:
You can chat with your contacts from Yahoo and MSN messengers, or at least that what I was able to check, using txting that is useful I think when you do not have enough memory or you do not want to have a IM software on you phone!
The way I noticed it is by sending SMS using the messenger to the cell phone, the message will appear coming from a weird number, it is an 8 digit number from both Yahoo and MSN, save this number to the contact who sent the message and later use it (that 8digit number) to txt them back, and they will receive the message on their messenger.
I think this is useful also txting friends overseas, at least it will be cheaper not $0.20 like Sprint charges.
I hope I was clear enogh and did not confuse people
