I'd love to see a lesson covering some of the "basics" of computers and internet vocabulary. The possibilities are endless, but here's some starters:
Navigating from page to page - Telling someone to go to this page, the page won't load, refresh the page, etc. The buttons on the page - go, search, click here, next, back, reload, refresh.
Using search engines, how to "googlear" something.
Talk about signing into web pages, signing out of web pages
Talk about email - sending, receiving, did you get my email, send me an email, address books, mailing lists, deleting email, spam
Talk about viruses on your PC
Resolving simple computer issues - printer not working, rebooting, installing software, etc.
calling customer support and describing problems and getting the solution
Talking about wallpaper and screen savers
Downloading files
Posting in forums - registering, posting, editing a post, deleting a post, etc
Talking about podcasts. Is there a Spanish word for podcast?
Terminology for files, folders, desktop, shortcuts, keyboard, monitor, power cables, cd drives, laptop, usb cables