Which is the best?
Criteria:
1. Free!
2. At least 500 MB.
3. Original quality pic download.

Any contenders?

Since you need that and don't mention speed, your best bet might be locally hosting it (IIS or apache). Half decent free hosting is a rarity nowadays, add 500mb space requirement to that and there's not much left if at all. It only gets worse if you need some other common features like php/mysql, decent speeds and such. Next option wouldn't satisfy your "free" requirement.

*topic moved

imagevenue.com

Ofoto like site. With Albums management and so...

imagevenue puts logos at the bottom of your pics and limits file size to 1mb. storage period is unlimited (don't know any sites that limit that anyways), unlimited bandwidth (that usually means your bandwitdth is limited by the server's speed anyways). No owrd on if they'd let you use a half gig worth of storage. Not sure about their speed, reliability, and they seem low on features...

Ofoto has unlimited space, more features and everything. (never tried it, so I'm not sure how good it really is) It's by kodak and they make money off selling prints.

I still prefer hosting my stuff elsewhere (your own website) and getting prints done how/where you want it.