Selected Posts for WordPress.com Bloggers from WordPress Tips

Maximum displayed image width
Sidebar width
Page tabs as extra links
Posts on pages
Image quality
Html allowed in comments
The gigya shortcode: inserting flash
Codes useful for text widgets
sidebars and other widget areas
Child pages: links displayed on parent or as dropdowns
Sample collections of third party widgets
Table coding for WordPress.com users
Themes with built-in RSS and social media icons
Where is the theme CSS and how do I edit it?