Greg Christopher of Dark Horse Game Design examines polytheism and D&D. His analysis is that DnD does it wrong as compared to real world examples of polytheism. I can see his points, and I think his analysis is pretty accurate, though I'm not sure it matters. Either way it's worth reading. The comments are well worth perusing as well!
Tim of Gothridge Manor wrote a great post about the mystical nature of crossroads, and Paul of Quickly, Quietly, Carefully expanded on Tim's ideas. Both posts come with a table for determining what you find at a crossroad. Tim's list is vaguely horrific, while Paul's is more fairy tale.
The Jovial Priest has an interesting house rule for a wizards wand and staff. I must admit that as compared to a Harry Potter style wand or wizard's staff the Dungeons and Dragons counterparts are seriously lacking in awesomeness.
Paul of Quickly, Quietly, Carefully posted a house rule for what happens when spell research fails. In the best tradition failure not meaning a dead end, his ideas give the wizard a chance to successfully complete his research, it just becomes more difficult.
Justin's Field Guide to Doomsday (A Bestiary for Mutant Futures, Gamma Worlds, and Assorted Post-Apocalyptic Wastelands) has some bizarre offerings, but Hitchcock has to be my favorite.
Old Guard Gaming Accouterments offered up the Stone Woman, who would fit very nicely standing at a crossroads.