Everybody making records of their accounts....don't forget your physical-only releases! Stuff like the Benny single releases, Dark Shadows' first two releases, and a bunch of others aren't going to appear in your downloads list.
Will be saving a list of my downloads like others here. I'm not assuming something will go wrong, but it can't hurt to be safe. I've been using the same email since I bought my first Big Finish release so I've got all the receipts in case they're needed.
When a website you know really well changes it can take some time to get used to, but it'll be worth it if looking through releases is made easier. As it is, the ranges page is a bit of a mess. I imagine they didn't imagine they'd end up with as many ranges as they have now. The page is whole load of Doctor Who logos with a small bit of text underneath each one. The worst part is you can't ctrl+f to find the range you want because they're images.
The wishlist is a very welcome feature. When I'm trying to decide which stories to buy myself it'll be handy to have a list of my most desired releases.
If you go to My Account and click on View orders on the right hand side, it will list all your purchases. Mine even lists the times that my order didn't go through (those are grayed out). Then you can save that page or copy it into a word document.