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The team over at Internetwork Experts (INE) has assembled a great set of free training videos that cover a wide range of topics, available via this link:
Their latest and greatest will cover LDAP Synchronization and Authentication in Unified Communications and will be broadcast on Dec 14. Sign up if you want to watch it when it's first broadcast, or if you wait, it will probably be posted on that page like the others.
Also, if you haven't given it a try yet, check out the free 60 minute login over at CBT Nuggets:
They basically give you a fully functioning account for an hour to watch whatever videos you want. If you haven't already signed up to view Jeremy's ROUTE video series, I highly recommend it!