Starting with IBM Connections 3 the Websphere wsadmin command is even more important as the only way to deploy Connections is using Websphere Application Server Network Deployment or ND for short. The wsadmin command is used to check out the Connections configuration files and check them back in after modification. Because some commands require different configuration services to be loaded I have started compiling a cheat-sheet of some of the commands one use all the time. I have created a page for them. Expect the list to grow over time.
Of course the Info centers and wikis also list the commands.