TL;DR: I made this: Instaud.io - quick and easy audio sharing for audio producers (music producers, singers, musicians, voice actors, sound designers...)
Over the past few months I've been working on a simple website for super simple audio file sharing. The target audience is musicians like you and me, who like to frequently share bits of work in progress on social networks or over IM, to get some feedback before finishing the final product and uploading it to the NGAP, SoundCloud, or what have you.
The main objective is to make it quick and simple, and I like to think that's what it is right now.
All you do is drag a file onto the page (or use a conventional upload button), wait for it to upload, and you get redirected to a very simple page with just a big audio player, under a short URL.
You can click on the progress bar in the player to advance to somewhere in the file, just like you would with any audio player. The difference is that the URL updates to include the time point you've selected. This lets you link to a specific point in an audio file, which makes it all the more useful for feedback.
Here's an example of an audio page: http://instaud.io/t
That's my attempt at playing a simple version of Requiem for a Dream, but I digress.
You don't need a user account or anything, you just get on there, upload your file, and you're done.
You have the chance to delete the file again as long as you don't close your browser. If you still need a file deleted after that, you can use the link in the footer.
I am continually working on improvements and new features for this thing; if you want to stay up to date, you can do that through Facebook or Twitter.
I hope y'all find it useful!