If you're addicted to Just Dance 3 for your Wii, make sure you check out the collection of songs you can download! They're fairly cheap, and can add hours and hours to your dancing fun.

All the single songs are 250 Wii points each.

baby don't stop now / anja
baby girl / reggaeton
beat match until I'm blue / sweat invaders
boomsday / sweat invaders
cardiac caress / sweat invaders
crazy christmas / santa clones
dun n dusted / sweat invaders
fame / in the style of irene cara
i like to move / groove century
jambo mambo / ole orquesta
jump / studio allstars
just mario / ubisoft meets nintendo
katti kalandal / bollywood
merengue / sweat invaders
musgy baloney / charleston
rasputin / boney m
skin-to-skin / swat invaders
soul searching / groove century
that's the way I like it / kc and the sunshine band (250
the power / snap!
touch me want me / swaet invaders
toxic the hit crew
twist and shake it / the girly team
u can't touch this / groove century
walk like an egyptian / the bangles
who let the dogs out? / the sunlight shakers
why oh why / love letter
jump in the line / the sunlight shakers
iko iko / mardi gras

You can also get predefined 3-song packs for 600 points, saving you 50 points.
sweat pack 1 (600)
sweat pack 2 (600)
valentine pack (600)

This list is accurate as of February 28, 2012. I'll update it if I see more songs added on to the list.

The two songs I downloaded myself to test out were Jump in the Line and Iko Iko. Jump in the Line is the song from Beetlejuice, the "shake shake senora" song at the end of the movie. It's a lot of fun and is a duet with a pair of pirates dancing.

Iko Iko is the classic "hey now, hey now, Iko Iko all day" song. It features a single dancer in a full body Mardi Gras outfit.

Both songs involve a lot of arm-shaking and leg-shaking moves and are quite a lot of fun.

The Charleston one does look like fun, with people in 1920s outfits. It could be a cool way to learn an actual dance step, in case you have any flapper parties coming up!

Buy Just Dance 3 from Amazon.com