When visiting I'm usually at Stackoverflow.
I code XHTML as application/xhtml+xml and CSS 1/2~2.1/3, padding property used very sparingly.
I code object oriented PHP.
I code normalized relational MySQL.
Disclaimer: exchange sites are fundamentally flawed due to the positive-feedback power-trips people gain by reputation. While these sites can be great for quick answers many people with excessive amounts of reputation use that to greatly change the context of content so if you see something unintuitive/stupid in any of my content please keep in mind that intelligence is second to reputation here.