It's the "attached file" at the end of this post (in the middle of the page).
xda-developers - View Single Post - [ROM] Warm Z TwoPointTwo [RLS1] [2/23/2011] Re-Engineered Nightlies [4/23/11]
Just download it and leave it on the root of the SD card. It temporarily gives you clockwork mod 2.5.xxx so you can flash certain ROM's and for me in particular the MIUI camera. I think there's a MIUI that flashes with 3.0.0.8 but I didn't have much luck with it.
Boot to recovery>flash the temporary CWM .zip>important step, DON'T REBOOT YET, do your data wipes>flash the camera or what ever file you needed to flash THEN REBOOT.
After the reboot you'll be back to CWM 3.0.xx but the .zip of 2.5 will still be there on the SD card if you should need it and don't feel like searching around for it.
This is not my post, I only found it on XDA and it's worked well for me everytime.