I’ve posted about this before, but it really is worth revisiting as it changes regularly and is added to of course, so if you haven’t heard of or visited the London Sound Survey then this is something you really should do, and even if you have, but haven’t been to the site for a while you should take another look, especially if you have an interest in field recording or found sounds.
The Apps World expo and conference is only next week now. Whilst this is probably only of interest to UK based developers, you might want to just have a look at what’s on in the expo, which is free to attend. You can find a link to on the Palm Sounds home page. It’s right at the top on the right so you can’t miss it.