俺が使ってるモジュール
[Drupal 5.7系サイト]
Custom Breadcrumb, JQuery-update, upgrade-status, update-status
Event, FCKeditor, IMCE, Image, Image-assist, Lightbox2, Token,
Sitemap, Simple_menu, potx, captcha, recaptcha, extlink, jbox,
archive, content_template, bbcode, backup_migrate

[Drupal 6.2系サイト]
Menu Breadcrumb, JQuery-update, FCKeditor, IMCE, Image, Image-assist,
Lightbox2, Sitemap, Simple_menu, potx, Quote, FAQ, WebFM,
captcha, recaptcha, extlink, advanced_forum, jamail, archive,
content_template, bbcode, backup_migrate

CCK, Views, Dateは俺の使い方ではいらないので入れてない。