Kinda mundane but it fits with the theme: well before 9/11, a client of the small web agency I was at wanted full drag and drop file management for their company's driver/manual download site, all integrated with their web admin portal. this would've been hilariously complex to implement "web native" with the browsers of the time, and their budget was ... not large. so we slapped an iframe in that part of the admin portal with the url pointed to ftp://admin:whatever@dl.theircorp.com. dumb, but it worked and took like a minute to hack out; client was happy. so it goes?