H1's, Title Tags, Meta Descriptions
********** Google Update **********
In case any of you missed it, Title tags have been increased to 70–71 characters, which is up from its previous 50–60 characters. In your google Search Results. Also, meta descriptions have been increased by 100 characters per line, and extended from two to three lines.
So it's a good opportunity to get crafty with those extra characters to help increase your conversions.