Accessible Twitter adds in the requirement for accessibility, while giving the Twitter interface a slick UI that everyone would love. Here is a small partial listof what they offer:
# All links are keyboard accessible.
# Simple, consistent layout and navigation.
# Headings and page titles are implemented for optimal accessibility. This includes an H3 heading (for author screen name) added to tweets to assist with screen reader users.
# Large default text size and high color contrast. Layout/text resizes without breaking.
# When entering tweets, audio cues indicate when the character limit is almost reached (in additon to character counter).
I logged in to the site (with the optional timeout of 30 minutes forced) expecting to see something bland and simple. I was quite surprised. A clean background, easy to see commands and an easy to understand menu bar.
This is worth using on a daily basis if you use the web only interface.