Whitney Casey is fast turning into the gift that keeps on giving.We got an e-mail blast from "her people" today, touting the new book by the Houston Chronicle columnist and former Great Day Houston host."Relationships expert Whitney Casey, who has dated Lance Armstrong and Rocco DiSpirito, and was married to Jason Sehorn, has a new book out today!" it said.Wow. Bona fides have been established.We then learned many other things about her today. First, via the Chron's "reader representative," the