Increasing the frequency of the Profile and Membership Sync timer jobs
One of the new features in MOSS 2007 is the ability to synchronize WSS user data to SharePoint Server. One of the areas where this is synchronization is displayed is within the MySite SharePoint Sites web part which will display all sites that the user is a member of.
The default frequency of the synchronization job is every 1 hour but you can increase the frequency by running this STSADM.exe command:
stsadm.exe -o sync -synctiming M:15
which will result in the sync jobs occurring every 15 minutes.