Late to the thread, but it’s worth saying how convenient it can be to find a book online and just email it to the kindle, no cables or arcane software wrangling needed.
If you don’t mind having a generic cover and occasional janky formatting, it feels like a bit of wizardry every time I track down something I want to read and it’s there on my e-reader in a matter of minutes.
This also applies to checking out titles from the library, assuming they’re not wait-listed. Even after years of reading this way, it still tickles me whenever I can just pick a book and be reading it without getting out of my chair.