Since several sites have been dealing with issues related to payment processors lately, I've decided to post a quick list of which sites are running without issues and which sites are still trying to fix things. If you want to see the current status of which sites are accepting payments, check this list out.
The Working Sites
With no downtime that I have heard of, this site always works fast and predictably. Credit card payments for filling your account work fine.
They had some problems with their payment processor, and a few days where payments weren't possible. They also did some work with their catalog that was giving some users problems, but that seems to have been sorted out alreay. They are back in action, and credit card payments are up and running again.
After a hiatus of a couple of weeks, this site is also accepting credit cards again. It looks like they are back in action as well, with new releases being added on a regular basis.
Still working like usual - credit cards are a go, as well as several other payment options (useful if you don't have a credit card at all!).
You can pay with Mastercard or JCB, but not with Visa for some reason.
This site is working fine like usual, and customers can pay using a variety of methods.
Credit card payments are also working fine here and the new site design is quite nice.
You can only buy $35 worth of credit right now for some reason, but at least you can use credit cards if you want.
Credit cards are working fine here - they offer several payment options.
Everything up and working fine - you can use credit cards here as well.
Credit cards are working here as well.
Up and working, but only accepts VISA (like always).
This site still doesn't accept credit cards. However, Webmoney and e-gold are possible solutions. I have tried Webmoney there and it does work as simply as PayPal does (after you have your account setup at Webmoney).
The Not-Always-Working Sites
These guys were up for a while, and now they're back down for a "site redesign". I hope that they get their act together, since many people were impressed with the music catalog the offer.
This site is up, but it still isn't possible to make a payment there.