The search field has a title attribute of "[ALT+F]". While this works on SOME browsers, it can confuse users with other browsers, as witnessed by me and my DokuWiki installation with 100+ users.
Please either remove the title attribute, or make it browser specific (Display Alt-Shift for Firwfox Version 2.x+, etc). For an overview over acceess key combinations see
http://www.wats.ca/show.php?contentid=32