The 66th @Play column covered every skill in Dungeon Crawl Stone Soup 0.5.2, and listed applications for each. It can be found at http://www.gamesetwatch.com/2010/02/column_play_crawlapalooza_part_1.php
In the comments, a Crawl dev team member noted that the Divinations spell will go obsolete soon. I note in the column text that Darts is also going away soon. Another commenters noted how the "WowDeath" account at alt.org managed to end three consecutive games in 2007, all on the same day and at experience level 1, from damage done by kicking a wand of wishing; they used a since-fixed Nethack random number generation exploit to ensure finding one of those extremely rare wands on the first dungeon level each game. It just shows what I've always suspected: roguelike gamers are hardcore.