Accesskeys are used to be able to ease the navigation of a website with the keyboard only. Here's a list of the access keys defined in the freshmeat pages:

Key	Description	Path
a	articles	/articles/
b	browse	/browse/
f	search query field	n/a
g	'go' button on frontpage	n/a
h	freshmeat homepage	/
i	'ignore' button on frontpage	n/a
m	personal homepage	/my/
n	instant mesages inbox	/im/
s	'subscribe to' button on frontpage	n/a

Accesskeys are activated differently on different platforms, please refer to your browser documentation for details. (Hint: Pressing Alt Key or the Cmd Key on a Macintosh plus the accesskey should pretty much cover all major platforms).