Now, see, if I'd been thinking I'd've made a Nandroid before flashing. You know, like mentally stable people do. Unfortunately, thinking wasn't on the menu.
I flashed Zedomax's 2.3.5 and will do an ODIN -> Stock 2.3.6 -> root again once I touch my Windows PC again tonight.
Learn from my failure! Nandroid now, nandroid tomorrow, nandroid forever.