I find getting out of the house and doing something to be a good way to overcome laziness.

If I get out and do something it gives me a chance to refresh from my girl, work, school and computers.

I prefer to mountain bike, hike, play disc golf, rollerblade, fish, rock climb, camp out for a weekend, go 4x4, or anything outdoors. Even a night at the bar can help out... but I'm even more lazy the next day because I'm recovering...

If I get bored with a book... I'll head down to the beach. When I get tired of reading a bit... I can look up at the ladies (can't do more than look... I already have a girl)... or jump in the water and then get back to my book.

My state actually has a site that promotes these types of activities.