[Boost-users] BGL examples?

I am just a beginner with BGL :-( so maybe someone can point me to URLs. I have read the excellent user guide, reference manual by Siek, et. al. And I have the examples they give running with 1.47.0. My team leader wants larger networks of nodes (80 < n < 800) and random links to time-compare SSSPs BFS and Dijkstra algors (and even Bellman-Ford although I do not know what negative weights represent). Is there a URL with more extensive C++ samples for larger networks. And how does one read, write data instead of hard-coding. Maybe reading, writing with AT&T graphviz: read/write_graphviz examples, as well, are appreciated. Thank you for your patience. Andrew M. Neiderer US Army Research Laboratory