Here are few things you can do after installing Fedora 15 to make the experience better. You may have to enable sudo to follow some of the tips or you can run the commands in terminal by logging in as root (su). The following are in no particular order.
1. Enable sudo
2. Install yum-fastestmirror plugin
yum-fastestmirror selects the fastest mirror for updating and installing packages. It can be installed by running the following in the terminal:
rest here