When I'm looking for new workout songs I go to the Essentials and imix section of iTunes. There are tons of workout playlists from iTunes and ones that people just create. Some are hit and miss, but I've found some cool stuff that way.

My personal favorites:

Mr Hudson - Supernova
and
The Josh Guru Project - Infinity

Look them up on youtube. It may be hard finding downloads for them because they're not really popular. The first one you'll probably have trouble with. The second one, not so much.

Technotronic - Pump Up the Jam.
Animal Collective - Fireworks
Jimmy Eat World - The Middle
Pitbull - Go Girl
The Secret Handshake - I Wish
Eminem - Till I Collapse
Hollywood Undead - No. 5
Calabria - Enur
Girlicious - Like Me
Enrique Iglesias - Push

I'm not really sure what you're into so I gave you a little bit of everything.

Thank you for your respeonses.

Jen- I will have to check into that I didn't even think about that section on itunes. Thank you!!!

Jemmappellesierra- I like a little bit of everything that is a good list! Thank you so much! I am downloading these right now!

It really helps the time go by on the tredmill with good songs! Thanks guys!

I listen to stand up comedy or audio books when I workout. I hate searching for music or when a song I'm tired of starts and I just need to find something different...it brings me out of "the zone" Comedy and books on tape just keep going and going for awhile and I definitly keep at it longer when I listen to them instead of music.

give it up to me -shakira
carry out-timbaland f/ justin timberlake
go girl-pitbull
just dance-lady gaga
milkshake-kelis

Great Idea!!!!! I never even thought of that either! Yeah I keep getting tired of that too I keep scrolling through my mp3 player...thank goodness last night when I went to the gym I had to some new songs thanks to the people that posted some already but a story or some stand up comedy will be great. People will wonder what I am laughing at! hahaa Thank you

I used every single one of those songs last night and I loved them all I even found the two that you said might be hard to find...thanks again!

great music choices! I already have carry out , go girl, and just dance but I forgot all about milkshake I have it in my head now! Must download Thank you!!