How disabled users access the Internet

Since best practice on access keys is unclear, our approach has evolved over time (and sometimes also reflect the preferences of different designers.) Our most recent implementation is probably M&S Corporate:
http://www2.marksandspencer.com/help/policies/corp_statement.shtml
which limits the number of access keys, and mostly sticks to numerals.

Yes, the purpose of the accessibility statement is partially to acquaint users with the access keys used, so we're hoping alt-0 becomes more familiar for this purpose. Note that we also use a small "skiplinks menu" at the start of all pages, so regardless of whether access keys are used, this enables people using the keyboard to navigate to quickly reach different areas of the page.

But we are in the process of re-evaluating our position on access keys. So I don't want to imply that the examples I provide are foolproof. In tests with screen readers users, you rarely get people using access keys.

If you want to find lots more examples on the web, you can simply google for accessibility statements --
http://www.google.com/search?q=%22accessibility+statement%22
-- or for "access keys".