TinyUmbrella 4.1.8 version have been released and is available to download. It comes with some improvements which are given below. You could use TinyUmbrella 4.1.8 to save SHSH blobs of your iPhone, iPod Touch or iPad firmware to downgrade it to previous firmwares. You could also TinyUmbrella 4.1.8 to update iPhone 4 to iOS 4.1 without baseband upgrade.

Download TinyUmbrella 4.1.8

1. Totally redesigned UI for all platforms (inspired by chpwn refined by me)
•Original artwork by iOPK of Chronic Dev Team
•Spinny Icon code (thanks to technomage)
•Quaqua look and feel (sorry mac only due to license restrictions)
•Much cleaner look and feel all around
2. Known Devices!
•Now all devices detected by TinyUmbrella are saved for future use!
•You can remove them as well :) (Right click -> delete from history)
•You can save SHSH with known devices as well (No more requirement for the device to be connected)
3. Recovery Devices
•If you connect a device in recovery mode you can still kick it out of recovery (Right click -> Kick out of recovery)
4. Save SHSH now saves ALL SHSHs available at Cydia with one button press!
5. Preferences
•Change SHSH save directory
6. Proxies (Web and Socks) for those that need them!
7. Better port 80 detection.

Download TinyUmbrella 4.1.8 from here.