One thing that really is a matter of concern for the most number of WP7 users is the lack of multi protocol IM apps on the marketplace. IM+, a popular Multi protocol IM application which is avialable on most of the mobile operating system, announced some time back that they are developing an IM app for Windows Phone 7 which will be released in the month of April. Not much time left for the month of April to end and looks like they will be missing the target release date. The application is still in development but after request from bunch of users, they have published an image showing screenshots of the application on their facebook page :
If you see the screenshot above, you will noticed that the application probably doesn't have live tile support ( which is pretty essential feature IMO ) and you can live chat with multiple users by swiping left or right accross the screen, hopefully. More to come soon, we are hoping to get access to the beta version of the application. Stay tuned.