Pasadena-based Guidance Software, a provider of software used for computer forensics, debuted yesterday on the Nasdaq. Guidance offered 5,000,000 shares of its common stock at $11.50 per share, in a $57.5M IPO. The IPO was underwritten by Morgan Stanley & Co., Lehman Brothers, Wachovia Capital Markets, and A.G. Edwards & Sons. Guidance is now trading under the symbol GUID on the Nasdaq, and closed at $15.18 per share after its first day of trading.