I really like Queen to move to, I have the greatest hits cd, and I know when I walk outside where I should be according to the song being played as far as distance/time ratio is concerned, plus some of their songs are very motivating for me ( "Don't Stop Me Now" is one of the great motivational songs for me...)
Lately I have just attempted running on the treadmil. I use a few songs back to back that really get me through the tough parts. It's hip hop though. They are:
Pit Bull-The anthem
Rock this party-Bob Sinclar
Da Dip- Freak nasty
Come baby come-K7
I tend to like fast songs to just keep going. What i find also works is to use songs that remind you of positive things or experience. I like the beach boys because they remind me of the beach-Bathing suits and make me want to work harder.
I usually download music off my computer onto my MP3, I just search for cardio or aerobic. I've found some great 80s music remixes with a techno beat. I even put them on a cd now so I can listen in the car, too!
I listen to alot of the old stuff, like canned heat. It is rather hippified but is very upbeat and posative! The song that always gaurantees me to get moving is also 'lets work togethe'r by roxy music. Also:-
Ministry of sound anthems,
Beyonce - work it out,
Madonna - Hung up,
September - cry for you,
Dee lite - Groove is in the heart
The best site I've found for workout music ideas is inthegym.net ... but I do have quite a few of my own personal playlists on my blog if you're interested. I listen to a little bit of everything! (I can't post links yet, apparently, but the site is listed in my profile. It's the babyfat one!)
Oh, and if you do decide to head over to my blog the playlists were all posted in April so you'll have to go the right side archive thingie to find them (or click on "older posts" at the bottom of the screen"!