The best Minecraft Hack Client is now updated to 1.8 aswell, there are still some bugs so if you find them please report them. This version works with Minecraft version 1.7.3 and version 1.8. Pickaclient is now updated and you can go on playing!
How to use it?
Delete / rename your old minecraft.jar and past the new in the same folder, rename the new "minecraft.jar". (%appdata%\Roaming\.minecraft\bin)
Download link : Download