Very strict, adherence to CSS/XHTML
a new "free" version for education
Tabbed browsing, sessions, "wand" password manager, pop-up blocking
VERY strict adherence to CSS/XHTML. (This can prove to be very tedious for web designers and developers.
Downloading the education version invloves filling out an application and waiting for a password from opera.
has web developer tools extensions, but they are difficult to find, download and access quickly
has a multiprocess architecture, protects your from having a bad Web page or application take your browser down.
Built into the Operating System
Doesn't have the kind of security problems that plague IE on Windows
User style sheets ("Pimp my Safari")
RSS feature not yet available
One product across platforms
Intuitive and streamlined GUI: easy to apply skins and rearrange icons\
User scripts which lets users change not only how a site looks, but also how it functions
Trails IE greatly in overall market share
Recently released as a version 1.0 product
Only browser that works with Windows Updates (via web)
Speedy browser for high majority of sites
The "default" option when a site doesn't load properly (granted this is the site's fault, but still a plus for those who want/ need to get there
no popup blocking for Win2k or XP SP1 users
Very little development for standards- compliance and innovation
no tabbed browsing