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Drupal
API reference - Drupal 6.0 API

Re-enable comment in on existing pages
UPDATE node SET comment = 2 WHERE type IN ('page', 'geshinode')

e-commerce suite
http://drupal.org/project/ubercart

Best Drupal modules
http://drupal.org/project/google_plusone - Google Plus One +1
http://drupal.org/project/xmlsitemap - XML sitemap
http://drupal.org/project/page_title - Page Title

HowTo update modules
install:
cumulus
download http://ftp.drupal.org/files/projects/cumulus-6.x-1.3.tar.gz
extract
upload to /modules/
download http://pratul.in/files/cumulus.js
upload to /modules/cumulus
configure:
admin/build/block/configure/cumulus/
Highlight color of cumulus: 000000

Drupal redirect after logout
A simpler solution is just to add the query string ?destination=MY-PATH to your logout link.

WP-Cumulus (3D Tag viewer)
http://wordpress.org/extend/plugins/wp-cumulus/
http://drupal.org/project/cumulus - Cumulus allows you to display your site's tags using Flash that rotates them beautifully in 3D
http://drupal.org/project/tagadelic - Tagadelic is a small module that generates a page with weighted tags. (needed by Cumulus)
http://pratul.in/files/cumulus.js - JS script needed by Cumulus, save under modules/cumulus

View a block only on start page

404 redirection in drupal with all blocks
YOUR_SERVER/admin/settings/error-reporting
Default 404 (not found) page: Home
http://drupal.org/project/blocks404

Links
http://drupal.org/node/15365 - Clean URLs
/admin/reports/status - Status report

Settings file
sites/default/settings.php

enable default drupal statistics
/admin/reports/settings

Reset nodes read count
UPDATE node_counter SET totalcount = '0'