In running my marketing events, I'm often prompted by people to ensure I don't focus too much on B2C marketing and ensure I give some airplay to B2B marketing. Whilst many of the same rules apply, there are some "tried and true" business marketing rules you can't escape, like the need for more personal selling and relationships. Innovative marketing then becomes more about how good your lead generation and then sales team are.
Anyway, I came across a great blog that listed FIFTY B2B marketing blogs. So if you need some inspiration, follow that yellow brick road.