Well, it's pretty cutting edge...there isn't a lot of literature on it...yet. It's an idea which I've written about quite a bit, but it depends upon knowing quite a great deal about microblackholes--how they evaporate, the rate at which they evaporate, nailing down the basic physics involved...etc.

There are some interesting papers available on ArXiv.org:

http://arxiv.org/PS_cache/arxiv/pdf/0812/0812.3442v1.pdf
http://arxiv.org/PS_cache/arxiv/pdf/0811/0811.1622v1.pdf

There are hundreds of papers on the subject of Black Hole evaporation, and many are really quite fascinating...once the new experiment comes on line at CERN, we may know a lot more about black hole evaporation once we begin to see actual events...

In order to even think in terms of a propulsion system, it will be necessary to nail down rates of evaporation versus energy of formation. If a black hole cannot be 'force fed' to bulk it up to microgram levels of mass, then the rate of power generation will probably not be sufficient to be useful for propulsion.

TRL (technology readiness level) is still Zero: basic principles have not even been demonstrated yet...