I smoked my corned beef this year; it turned out great!
This is how the process went:
5 pound point-cut corned beef
2 T. freshly cracked black peppercorns
1 T. cracked coriander seeds
1 tsp garlic powder
Combine the seasonings and spread across the fat side of the corned beef. (Did I mention that you throw away the little packet that comes with the beef? Well, you do!)
Prepare a fire using 12 charcoal briquets in a covered kettle. When coals are ready, top with smoking chips or chunks of hardwood--I used a combo of pecan and apple this time--place the beef on a rack across from the fire, cover and smoke. You will smoke the corned beef until it reaches an internal temperature of 165º F., and that will take about 5 hours depending on the fire, the weather, etc. Plan to add more charcoal every 1&1/2 hours or so and to add more wood for smoke as necessary. (Sorry to be so inexact here, but Kingsford charcoal may burn differently than grovery store brand, your wood chunks may be larger/smaler than mine, etc. The main idea is that you keep the cooking temperature at about 250º F, so don't throw in 30 charcoal briquets at one time!
When the corned beef has reached internal 165º, remove from the fire, wrap in foial, and refrigerate several hours.
Before you plan to serve it, steam the corned beef for about two hours--I use a Dutch oven with an inch of water and the beef on a vegetable steamer basket.
You are now ready to slice thinly and serve.
Good luck!