The block_navigation introduced in moodle 2 needs some love - we all know this.

An Information Architecture review would not go amis, but since that sort of thing seems to be poo pooed (see https://moodle.org/mod/forum/discuss.php?d=176557) i'll try and keep to one bug at a time.

Moodle uses the yui framework and should also follow the yui usability/best practice guidelines for using the yui code/lib.

YUI states you should "Never mix clickable parents and semantic parents in the same Left-nav Bar." which for moodle means not doing this in the block_navigation.

http://developer.yahoo.com/ypatterns/navigation/bar/leftnav.html

Example : On moodle.org click the my profile link in the block_navigation - does it take you to your profile? Nope. It is a semantic parent. It breaks the simple cardinal rule "Never mix clickable parents and semantic parents in the same Left-nav Bar." (replace Left with position of block_navigation).

Moodle's information architecture for the block_navigation breaks the yui guidelines for implementing a navigation list

Lets fix this and give block_navigation the love, care and attention it deserves