Since I use many different programs to do many difdferent things. For instance, I use MIDI, music, graphics, animation,and other programs. And often, I import creations made in one program into other programs, I have a simple way that lets me track all my creations, whether they are .bmp, mid, wav, mp3, or whatever. I also use several computers. So, I have done the same in all my computers. I created the folder C:\A. The reason to call it A is that it is very easy to type, I can not forget it, and it shows up quickly in my searches. In C:\A, I create folderes with logical names. A folder that contains synthesizer wavs is C:\A\synthwav.
If you don't know how to create new folders, the process is simple.
All you have to do is go to c:\, which is your main hard drive in "My computer" (I assumme you are using Windows). Open C:\. With your mouse inside the C:\ folder, right click. A set of options show up. Scroll to New. A new set of options shows. Towards the top, look for "Folders". Scroll up to folders, and click on it. A new folder called "New Folder" appears at the bottom of your C:\ folder. Right cliick on it and a set of options will appear. The second from the bottom should be RENAME. Click on it. Rename the folder by typing A.
Now, all you have to do when you save a drawing, a mesh, an animation, or whatever is using the "Save As" option on the File menu (Located on the left of the top bar in all windows programs). Browse to "C", then to "A", then, using the little folder icon on the right top of the saving window, create the folder you want for the type of files you are saving.
It will always be easy to find your files again. Take it from some ione that uses hundreds of gigabytes of memory.