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It's correct, just add the ScheduledPlugIn attribute to your class and implement an Execute method:
http://sdk.episerver.com/library/cms5/html/T_EPiServer_PlugIn_ScheduledPlugInAttribute.htm
There are some new features in CMS 6:
http://thisisnothing.wordpress.com/2010/05/13/scheduled-jobs-in-episerver-cms-6/
Where can I find documentation on howto create a scheduled job in R2? I found this http://world.episerver.com/faq/Items/How-do-I-create-my-own-scheduled-job/ , but it seems very outdated.