Hello Guac,

Finally someone is working on this!!! I have posted about same idea a while ago and was looking for programmers, but received little response.

Here are my 2 quarks.  This is how my original idea was different from yours :
1) Built-in auto-trading between currencies:
  a) the wallet would also have a decentralised torrent market, so that people can exchange Quarks for Primecoin or any other coin.
  b) If I have Quarks but the seller accepts only Namecoin, I can pay him that amount in Quarks and he will receive in Namecoins.

2) Plugin for Firefox, Chrome and all the major browsers. So that people can pay online or tip very quickly.  Must have a very intuitive UI, so that average internet user can use it.

3) all the wallets should be routinely backed-up in the cloud, so that people don't loose ALL their money just because their hard drive crashes.

4) Mobile apps - so that people can use their phones instead of credit cards ...just enter the amount and and tap another phone; or just tap the till and confirm -and the money is paid.
 
You might also want to contact the coin called "Kreditz" https://bitcointalk.org/index.php?topic=396313.0;topicseen - it's a new coin in development but it will have a completely new type of wallet with loads of  original features like routine payments like Direct Debit etc. You might want to join forces and collaborate.

A word of warning, I would be very selective about which coins should be included by default. There are a lot of shit-coins and scam coins that have recently appeared.  I'd include: Bitcoin, Quark, Litecoin, Peercoin, Anoncoin, Primecoin, Namecoin. The rest should write their own plugins if they have serious developers.

Keep it up!!