BioMedNet have posted a couple of interesting articles (free registration required). The first article is particularly dramatic - it describes recent research supporting the idea that we can actively forget, i.e., that forgetting is not simply an encoding failure (we didn't attend enough to put the information in memory in the first place) or a retrieval failure (can't find the memory, though it's there somewhere), but can be a deliberate process to erase an existing memory. This is not the same as reconsolidation (for which there is growing evidence) - that we repeatedly revise our memories in the light of later experiences. This research concerns a particular type of brain wave of which little is known, which has now been shown to be produced by cells in the hippocampus (a critical region for memory) at times when levels of a neurotransmitter thought to strengthen synaptic connections are low. It is speculated that the function of these brain waves is to erase some of the information that was encoded earlier.
The other article discusses recent research demonstrating how what we see influences our tactile perception (specifically, that most people, including those who became blind later in life, have difficulty knowing which hand is being touched when they can't see and their hands are crossed in front of them, while being lightly touched once on each hand - this confusion doesn't occur with those blind from birth).