Though connected to email with devices like a BlackBerry or smart phone, lawyers might still have trouble receiving faxes when out of the office. Internet fax services like eFax can take care of the problem. For a modest fee, the company sends all your faxes to your email address as a pdf file. To do this, they'll also need to provide you with a new fax number, but you can simply set things up so that faxes to your current number are automatically forwarded to the new one. That way, you don't need to change your stationery.
Note: This tip was suggested by an article written by Allan Press for the 12/06 newsletter of the Illinois Bar Associations Standing Committee on Legal Technology. ISBA members may be able to access the newsletter here.