Magento and Memcache with some weird bugs

When I launched some larger sites on Magento in August 2009 I was sold on the slight performance increase that memcache provided the cart. However, I ran into a few bugs and other anomalies that have caused me to abandon the use of memcache with Magento. Please note, it could be my implementation that was causing the problem since it was my first foray into memcache. Two problems Magento and Memcache caused