Apparently, e-mail isn't fast enough.After years of reluctance to add another potential distraction to their employees' work days, companies are starting to embrace instant messaging.Instant messaging isn't new to the workplace, but it's mainly been used by employees who have installed IM programs on the sly. Now employers are getting into the act. IM programs allow users to start casual, real-time conversations with co-workers on their "buddy lists," which show who is online. With IMs, not only can you get instant answers, but you can talk with multiple people at once.