HDMI is a digital signal, versus component, which is analog. That means that, while some minor signal degradation likely occurred over your component cable while displaying in HD, HDMI delivers pixel-perfect HD. In other words, you should see a minor, barely-noticeable increase in display quality.
The real advantage to HDMI over component, IMO, is true Dolby Digital 5.1 surround sound. Getting a true 5.1 speaker setup isn't that expensive, either; a cheap, decent-quality set won't run you more than $150.
"'Casual games' are something the 'Game Industry' invented to explain away the Wii success instead of actually listening or looking at what Nintendo did. There is no 'casual strategy' from Nintendo. 'Accessible strategy', yes, but ‘casual gamers’ is just the 'Game Industry''s polite way of saying what they feel: 'retarded gamers'."
-Sean Malstrom
