This is like The Gorby's standard 5x5 workout, but the last block is replaced with a small power pyramid. 40-20s, sweet spot, OU-FTP, z2 blocks - you'll hit them all. You should use this workout to hone your climbing potential after you've developed a solid FTP. Perform 1-2x per week for best results.
Sweet Spot Training (or SST for short) will give great bang for buck. Training at around 90 percent of your threshhold (aka the Sweet Spot) is useful because you can spend quite a bit of time there without building up undue amounts of training stress. You can do this workout as much as you'd like and watch your FTP rise over time.
This exercise is designed to increase your comfort at and around your threshold. Use the "Free Ride" blocks for skills/drills and any specific zone you're looking to strengthen, but manage your energy!