VoiceGem lets you easily and quickly make an audio recording (I’m not sure for how long, but it certainly went on for awhile during my experiment) without having to register. You record and then email it to yourself or someone else.
Unfortunately, there’s no way to get the url address to your recording without going to the email. That makes it less than ideal in class if you want students to make a recording and then copy and paste the url address into a blog, for example.
I’m still adding VoiceGem to The Best Sites To Practice Speaking English, but that list has similar sites that do give you the url address immediately.
You can never have too many of these kinds of sites, because you never know which ones will be blocked by school content filters.