If you can't hire a star, why not one of her best girlfriends? We hear Microsoft has poached BusinessWeek reporter Catherine Holahan for a new online-video project — MSN's answer to Yahoo Finance's Tech Ticker stocks show, which features Sarah Lacy, Holahan's former colleague at BusinessWeek and a close friend. (The two were rarely apart when they attended the SXSW conference where Lacy infamously interviewed Facebook CEO Mark Zuckerberg.) Lacy's known for her va-va-voom Diane Von Furstenberg wardrobe on Tech Ticker. But from the looks of some of her BusinessWeek videos, Holahan prefers a more informal look. Honestly, Catherine: Was a tank top the best look to go for, even when talking about as light a subject as Web widgets?