I've made this theme few weeks ago, it's a mod of iVillain by Justflikwalk, still work in progress but there will be no updates until iDev team will release jailbrake for firmware 3.1(i'm stuck with not jb phone atm). Fill free to mod it.
PS. To change weather location edit configureMe.js in Private folder. To get same results as on the screenshots please download and use iBlank and Reflective Dock via cydia. Best served with Agua icons by David Lanham and Louie Mantia. You can download them on macthemes.net or you can get my compilation of agua [link]