View high quality images

Question to the Habrasoobschestvu.

There is a high-quality image, what are the decisions about how users view these same images in fragments with a visible area of ​​about 500x500px?

What are the requirements / wishes:
Original images 5-10MB jpeg
Accounting for user channels throughout Russia, i.e. from broadband to ADSL with 128 limits, etc.
Protection from downloading the whole image
It is desirable to use some ready-made solution for these purposes.

It is not a question of creating a paid service, a social project is the theme of images of a work of art (painting, graphics, books).
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What first comes to mind:
1) organization of the googlemaps type of supervision
2) use SilverLight / Flex
3) Using Java applet

What confuses:
1) Google is Google, I heard somewhere about using the Maps engine for these purposes, but it will probably be difficult to agree with them, at least I don’t know how.
2) It is necessary to write from scratch on unfamiliar technology.
3) Generally a dark forest, frightening the cost of specialists in this field.

What advise, what technologies to pay attention to, what trends in terms of user interface?