Notcom has released TinyUmbrella 4.30.05 for iPhone 4, 3GS, iPod touch 4G, 3G, iPad 2 and iPad 1 to support iOS 4.3.1.
TinyUmbrella doesn't support Verizon iPhone 4 as iOS 4.3.1 still not available for it.
TinyUmbrella now supports 4.3.1 for the relevant devices. Currently only iPhone 4 for verizon does not have 4.3.1 support (as there is no 4.3.1 available for the verizon iphone). Enjoy!With TinyUmbrella 4.30.05 you can save iOS 4.3.1 SHSH blobs for iPhone 4, 3GS, iPod touch 4G, 3G, iPad 2 and iPad 1.