Nikotalkie is a Push-To-Talk (PTT) app originally for the iPhone, which took advantage of the persistent, unlimited data connection to bypass SMS message costs and instead send instant voice notes between handsets or direct to an email address.  There’s also a Windows desktop version and even low-cost VoIP functionality (although the basic PTT service is free), but up until now no version for the iPod Touch.  With Marian’s work on a plug-in microphone accessory, however, the team behind Nikotalkie has steamed ahead porting it to the PMP.

So far we’re waiting on a download option, but it’s likely to be added to Installer.app very soon.  Of course, you’ll need a microphone to make the most of it; check out this earlier post for details of how to get one.