[CentOS] What's going on with my Linux Swap?

Thank you for the advice. With a little tweaking, my partitions now look 
like this:
   Device Boot      Start         End      Blocks   Id  System
/dev/hdb1   *           1        3644    29270398+  83  Linux
/dev/hdb2            3645        3737      747022+  82  Linux swap

    Will Linux automatically start using that as a swap, or do I have to 
do something to mount it or in any way initiate it's use?

Dave