Script Download: UpdateFBAUserDisplayname.zip
http://gallery.technet.microsoft.com/Update-Users-Display-Name-f32f5a52

This script updates users display name after enabling Forms-based authentication (FBA) in Microsoft SharePoint Server 2010.

After enabling form-based authentication, you may want to change users display name to friendly ones.  Nowadays, you may notice that some display names are showed in this form, i:0#.f|membership|username. Suppose you need to manage a large number of site collections with FBA enabled, change display names will be a time-consuming task for you.

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You can find more All-In-One Script Framework script samples at http://aka.ms/onescriptingallery