You can peruse some of my introductory lectures on more advanced topics -- I have written several talks aimed at beginning physics graduate students. Except for the last three, which discuss topological quantum mechanics, they are meant cover aspects of mathematics useful for string theorists.

Title Notes
Introduction to Topology pdf (761k)
Introduction to Rings pdf (667k)
Introduction to Rings II pdf (894k)
Introduction to Modules pdf ()
Introduction to Manifolds pdf (729k)
Flows and Forms pdf (789k)
Vector Fields pdf (684k)
Bundles I pdf (752k)
Bundles II pdf (544k)
Introduction to Categories pdf (962k)
Sheaves pdf (116k)
Sheaf Morphisms pdf (1.1M)
Lie Algebra Representations I pdf (220k)
Riemann Surfaces and their Moduli pdf (121k)
The Witten Index pdf (130k)
Perturbative Calculation of the Witten Index pdf (90k)
Non-perturbative Effects pdf (1380k)