this would be reallllyyyy coool.....=)

Microsoft, Yahoo to Link IM Networks

Microsoft and Yahoo are set to announce on Wednesday a blockbuster interoperability deal that will reshape the landscape of the fragmented instant messaging market. The companies will connect their IM networks so users on each can communicate with one another using text and voice chat free of charge.

The agreement marks the first time major players in the highly-competitive IM industry have officially partnered up to enable cross-network communication. Interoperability has always been a hot topic among instant messaging providers, but had never yielded a compromise.