Hi there!
Im running a Mac OS X Lion and I migrated my user account to a new one, the old one was very slow and I had a hard time figuring out what was happening there. So I migrated to a new user account, updated MAMP and and tried to run drush. MAMP is going good, everything works (mysql is on, php is on, my sites on drupal run as well).
Now, everytime i run drush i get this in my terminal
"Warning: require_once(/usr/bin/includes/environment.inc): failed to open stream: No such file or directory in /usr/bin/drush.php on line 26
Fatal error: require_once(): Failed opening required '/usr/bin/includes/environment.inc' (include_path='.:') in /usr/bin/drush.php on line 26"
I guess it is installation related, but i cant seem to find where the error comes from. Googling the error wont give me any hint.
Any guess?
Thanx in advance!

Comments
I got a new clue while
I got a new clue while reading here: http://drupal.org/node/508450#comment-2700414
I get drush running when I type
$ drush/drush
Will keep posted if i get this fixed!