With its own link at the top of every page, your user page is as accessible as Wikipedia's Main Page. Because of this, it is your customizable Wikipedia navigation hub: just place your favorite Wikipedia and external reference links on your user page, and you can easily access them from anywhere on Wikipedia.
In Firefox, you can also get there instantly by typing Alt+⇧ Shift+. (Other browsers' access keys for your user page are covered in Wikipedia:Keyboard shortcuts, but they all include a period).
