I would like to apply to contest with my client as well.

.NXT (dotNXT)

It's pure .NET based client (yeah - no java required on Windows).
Planned release to public: 19 Jan 2014.
Supported features:
- Send Money, view your transactions.
- Register alias, browse aliases
- Forging (the transparent one as well)
- Hallmark checks
- Multiple accounts at 1 window

Currently known issues:
- Can not run as node
- Orphaned chains are not displayed correctly

Here are some screenshots that I just made 

Accounts view:
http://s21.postimg.org/okyqa62if/NXT_Accounts.png

Unconfirmed transactions:
http://s23.postimg.org/mvbuwxnu3/NXT_Unconfirmed_Transactions.png

Blocks:
http://s13.postimg.org/9qa1qmnkn/NXT_Blocks.png

Peers:
http://s17.postimg.org/dc9ug2873/NXT_Peers.png

Aliases: TBD