Currently there are little to no easy to use tools to administer ArcSDE. We still use the age old command line tools. I see that ESRI is going in a direction where "easy to use" will be given more importance.
It will be great to have a easy to use Graphycal User Interface to ArcSDE that can allow users to accomplish simple tasks like:
-Starting and Shutting down the services
-Gives ability to rebuild stats and indexes
-Be able to administer user permissions in regards to SDE.
-Be able see which users are logged in
Basically routine ArcSDE dba stuff.