Rated 5 out of 5 stars
I love HistoryBlock and have been using it since mid to early 2009. The one feature I feel it's lacking would be the ability to block keywords. This would be absolutely great. If you don't see how this is useful let me explain possible scenarios.
If you're a Facebook stocker (lol), you could put the person's last name that you're stocking into HistoryBlock. Then since Facebook profile names are in the title then they would be hidden. Another one would be the obvious blocking of adult searches. You could enter the common keywords (eg. porn) you use into HistoryBlock and you wouldn't have to specify any actually websites. I think keyword history blocking would be very useful for many people.