I have tried a number of "sharing" plugins that claim to be ready for wp 2.7 but all seem to create the same problem in wp 2.7
once activated the admin edit window starts not to work correctly (blank screen on update post, search does not work, not all scheduled posts are listed, anon.
It seems anything that these sorts of plugins add---some button, or shrae this, or pull down window, seem not to work when adding something to the "content" query in index.php file.
