Good article on blade steel. http://www.allaboutpocketknives.com/research/knife_information/blade_steel.php
Some people miss you on FTF - I remember your name being mentioned. Is this where FTF refugees gather ?
If your into making your own, and need a source for suitable stock. Bedframe rails for boxsprings are a much higher grade steel than you might think, and make better blades than you might expect. Old reel type lawnmower blades are high quality steel also. If your on a low budget, or have no budget to speak of, you can still get a pretty good blade out of them. No need to divulge your source.
Lord knows D2 is tough, it was considered for manufacturing but for EDC I like more corrosion resistance. S30V - like everything except Mea Culpa - Threetango - I saw your post today, is there a difference between you & just "Tango ?" Could be me, I get names wrong all the time.