With the increasing mobility of technology, helped by advancements like cloud computing, 3G or 4G services as well as Wi-Fi, people are starting to work away from the office. This can also in part be attributed to a desire for working within the comforts of one's own home, as well as the ability to save money on gas and other commuting costs.
Give your clients promo items that are conducive to them working from home. Promotional USB drives are great for this purpose. This convenient item emblazoned with your logo will give your customers the ability to take any important digital documents that may be on their work computer, or one of their co-worker's hard drives, and bring it home with them so they will have everything they need right at their fingertips.
Some of your clients might also have secretaries at the office to help remind them of important meetings. By giving them promotional wall calendars or desk planners that they can keep at their home office, this will allow them to function independently and never miss vital appointments, like video chats or sales calls.