The great and powerful Barbara Walters is back! Or will be! Monday. Mark the calenders. After more than a month away - in Barbara Walters' time, that's like five years for the rest of us - she told her colleagues via telephone at the top of this morning's show, "Hello, my darlings. I'm so glad to be talking to you. ... I really miss you." (Truth alert: Babs has been talking with them obsessively via phone; this is her show after all, and a little chicken pox isn't going to keep BW down.) As you know, the divine Ms. W had that nasty fall in D.C. just before the inauguration, then came down with chicken pox, of all things. She's been off since Jan. 22.