I could listen...
...to Luciano Pavarotti sing "Che gelida manina" every single day of my life, and still after I die, and for eternity times infinity, and never get tired of hearing it. When he talks about how his silly dreams were stolen by her pretty eyes, but he doesn't care because her presence has replaced them with hope... oh god, you just have to hear it, I can hardly breathe when he sings "speranza." How can anything be that beautiful and perfect? But it is. Some things in this life really are perfect.
If you'd like the lyrics translated: http://www.aria-database.com/translations/boheme1_che.txt

If you want to buy it as an MP3 single, you can get it from Amazon MP3 for 99 cents:
http://www.amazon.com/Boh%C3%A8me-Act-Che-gelida-manina/dp/B000VGXDMU/ref=sr_f2_1?ie=UTF8&s=dmusic&qid=1205935522&sr=102-1
They actually have versions of it from several different collections, so you can pick up different Pavarotti performances of it, or hear how a different singer (like Caruso) handled it:
http://www.amazon.com/s/ref=nb_ss_dmusic/002-4641472-9331200?url=search-alias%3Ddigital-music&field-keywords=Che+gelida+manina&x=18&y=24
Enjoy :)
I have the whole opera, it's a 1973 recording with Pavarotti conducted by von Karajan. I'm certainly no expert, but I think it's wonderful.
If you know a lot about it, do you have recommendations for good recordings of "Don Giovanni" and "The Queen of Spades"?