HTML
Information on meta data and tags - http://htmlhelp.com/reference/html40/head/meta.html
Implementing graphics/pictures - http://www.functionx.com/html/lesson06.htm
(this video is very easy to follow for starters)
CSS
learning http://www.w3.org/Style/CSS/learning
Styling tables with CSS - http://veerle.duoh.com/blog/comments/a_css_styled_table/
General
Understanding paths and directories http://www.webdiner.com/webadv/begin/paths.htm
World Wide Web Consortium http://www.w3.org/
If you need help generating keywords for your page - http://www.seo-watch.com/html/keyword_generator.php
w3schools - Good for learning HTML, CSS and other web-based programming(php,sql etc...)
Table centering using CSS or HTML http://theodorakis.net/tablecentertest.html
annoying padding issue in firefox http://gallery.menalto.com/node/55393