Hardware, software, a PC something or other to help you use your Atari. What have you found recently that piqued your Atari interest? (Note: it may not be new overall, but new to you.) Why? It may be unknown to some other user, so helpful in that regard.
For me, several things:
ATADIM.EXE (Winapp) which shows the contents of an ATR that is in Dos 2/MyDos format. Really handy -- drag the ATR to it on your Win desktop, and bingo! -- there are the contents listed.
MAKEATR makes it easier to send those stand-alone files over to the Atari. Even easier (usually) that using the APE PC Mirror.
A new directory lister for MyDos and SDX disks/images. Makes it easier to be organized and find individual files. Perhaps the author may post it? It's very nice.