One of the more popular group messaging services out there, GroupMe, has just released a beta of its latest update -- version 4.0. The whole idea of version 4.0 is a cleaner and simpler to use interface, and looking at the screenshots it seems to be the case. To participate in the beta, hit the source link below. It'll involve allowing installation of 3rd party apps in your device's settings and installing it manually, but may be worth a look if you're a big GroupMe user.
GroupMe is hoping to get participants to try out the beta who have already been using the most recent stable version to get the best feedback, but if you're interested in trying out the beta you can always download the previous version first (at the Play Store link above) and register to move to 4.0.
Source: GroupMe Blog