The list of the fonts we have updated to be fully compatible with iOS 5.0.1 / 5.1 and BytaFont 1.5 is available at iPhoneRuler.net
All the new glyphs for iOS 5.0.1 / 5.1.1 have been added (e.g. Siri microphone, emoticons, rupee…) and the new fonts handled by BytaFont 1.5 have been ported (Siri, iPad keyboard, iBooks).
If you apply one of these fonts and you still notice that something is missing, please contact us.