HTML

hand-coding and with editors
writing semantic HTML4, xHTML1 compliant code
research and testing HTML5
table-free code
CSS-driven layout and design
reasonable understanding of the DOM

CSS

hand-coding
external stylesheets for site layout and styling
understanding of inheritance
aware of cross-browser issues
use of well-supported CSS3 features that degrade gracefully, like text shadows

AS3

timeline scripting
external scripts
functions
listeners
arrays
conditionals
loops
math operations
loaders
video handlers
timers
memory tracking and clearing

JavaScript

aside from differences in syntax, JavaScript is essentially AS3, so most of the capabilities listed under AS3 apply. I am learning to crossover.

JQuery

properly loading .js files with fallback
proper use of the $(document).ready(function()
integrating plugins for slideshows

MySQL

moving DB to another hosting site
altering php scripts that access DB
with phpMyAdmin:
editing DB contents
uploading, backing-up, and restoring DB

XML

writing xml docs for use in flash and javascript slideshows including image data and text.