TwitlistReader is a project mainly written in PHP, it's free.
An easy way to read list from twitter with PHP
getListsFrom Get public lists from a Twitter user. @param user_screen_name the user nickname on Twitter. @return an Array of lists.
getListsStatuses Get the users statuses from a list. @param list_name the list name on Twitter. @return an Array of statuses.
getHTMLStatuses Get an HTML string of the users statuses from a list. @param list_name the list name on Twitter. @return an html string with al the statuses, nickname, text and date from each one.