Could someone post a step by step on how to check the MD5sum please?
To do it on your computer assuming Windows, (eg. for checking the md5sum of the zip after you downloaded it) download this and unzip it somewhere. Open the command prompt (press the windows key and type cmd in the search box then run the cmd program) then change the directory to where you put the files in the md5sum zip (eg. mine is in c:\fastboot so I type "cd c:\fastboot" into the command prompt window). Copy the file you want to check into the same folder as the md5sum files. Then type into the command prompt "md5sum <filename>". So to check the md5sum of a file called Smash41.zip, you would type "md5sum Smash41.zip". Once you do that it should print the md5sum into the command prompt window and you can check if it matches.
To do it on your phone (eg. for checking the md5sum of the image.bin after you unzipped it), there are a few apps in the market, such as AFV that can check the md5sum for you.