Originally released last summer and updated to version 1.7.3 just last week, it brings the convenience of FriendStream to the ICS platform, providing basically the same functionality, if not quite the looks. It only works on ICS at the moment (or Honeycomb+ if you're trying it on a tablet), but it's the only FriendStream replacement I know of out there until HTC releases its ICS Sense apps and widgets sometime this year.
For those looking to upgrade to ICS via rooting and flashing, which is what will have to happen on the EVO 4G unless Sprint changes its mind on the ICS rollout, there's now one less reason to wait.
Links: Market (EVO) | Market (web)