Is there a way to convert PEM files to PPK files? (you may guess that Amazon EC2 gives me a PEM file, and I need to use the PPK format for SSH connectivity).
Use PuTTYGen
vCloud Express now has the ability to create SSH Keys for Linux servers. This function will allow the user to create multiple custom keys by selecting the "My Account/Key Management" option. Once the key has been created the user will be required to select the desired SSH Key during the “Create Server” process for Linux.
Connect
Connect with Putty.
Click “Browse” and select the .PPK file you exported from puttygen.
Click “Open.” When connection comes up enter username (default is vcloud).
Instructions copied from here