To add to what Ken said, there is nothing like AIX smit or HP sam on Sun solaris. Admintool allows you to manage users, printers, hosts and with the Solstice line of products (adminsuite , disksuite) you will able to also manage disks, but nothing close to all the things (just about everything) SMIT helps you with.
You are going to have to use man a lot more. Too bad I.T. is not cash business
Luc Foata
Unix sysadmin, Oracle DBA