Other electronic formats should be available shortly, and of course I'll let you know when that happens. Or you can let me know, if you see it first.
The third book in the WVMP Radio series, Bring on the Night, will be released on August 1, 2010. I know, it's a long time after Bad to the Bone, but the good news is that the fourth book, tentatively titled Lust for Life, will be released six months later, in Spring 2011. So your patience will be rewarded! They'll also all be in mass market paperback (and so will Bad to the Bone as of February 23, 2010), so your wallet will thank you, too.
The change in schedule is due to the release of my first young adult novel, Shade, on May 18, 2010. My publisher wants to space out the releases so they don't compete with each other and so I don't, you know, go insane.