If you're looking at specifically speed, plyometrics are a great way to amplify fast twitch muscle speed. Just type "plyometric program" into google, check out Nike Sparq training (with LT), and take a look at The Vertical Jump Bible by Kelly Baggett. I have the Vertical Jump Bible, and while I haven't been able to do the program for some time due to football lifting and a busy schedule, my vertical and quickness have improved noticeably from plyos and the VJB. My vert raised from a 25' to a 33' in about a year and a half (which can also be attributed to cleaner eating, lower BF, and maturing muscles), and I always feel more agile after going through about 2 weeks of plyos about 3-4x/week.
Edit: Damn you, Rodja. Now it's not original advice.