17 Tweaks to Accelerate your WP states 17 methods meant from beginners to advanced. Some of the tweaks would require you to have your own VPS / server. Others may not really give you the best of results. I suggest trying out what works best for you.
Mark from Bloglyne.com wrote to me about the March for Dimes project to raise money which will be used to improve the health of babies by preventing birth defects, premature birth, and infant mortality. They have a goal of $1000 for the year. Do take a look if you are interested.
After I specified my stand on sponsored themes, woke up this morning to read another aspect that we plugin authors do not receive, the link love that theme authors get, except for a few plugins. Are you a plugin author? What do you feel about this issue?
Mark introduced me to AuctionAds (aff) soon after it was launched. AuctionAds by default is not contextual, but my article guides you through establishing just that.