Once you have submitted a valid solution it would be nice to be able to view source code of larger (or equally long) entries submitted by other people. That could be more exciting than just appear up in the score table, and we will learn something (at least me :)

Yes, I think it will be really useful to see the code at least for conclueded challenges.
In this way you can learn something new. That's my goal.

This has been discussed before. See this thread.