I assume you've come across 'Century Rain' and 'Pushing Ice'? If not, then both of those have BDOs in them.

There are BDO-ish things in some of Peter F Hamilton's books too, although I have to confess that I'm a lot less struck on the more recent ones. (Still haven't finished The Temporal Void, despite buying it, umm, ages ago).

And they're not exactly BDOs, but there are megastructure-type things in a few Jack McDevitt books too, I think.

And I can't think of any others, oddly enough...