I've been using Eyejot video mail for a few years now, and found it to be an excellent fully browser-based tool for not only communicating via video with my students, but also for generating and embedding language learning tasks in any of my various online applications (website, blog, forum, etc).
A similar service is offered over on Tokbox, fully free, with longer recording time allowance and some really nifty online video conferencing tools. It basically does pretty much everything Eyejot does and then some (I'll be demonstrating and reviewing Tokbox as an online language teaching tool later on this blog) - but my main issues with Tokbox at this point are that the embedded videos tend to look pretty tattered and (most importantly) it is a free Beta service.
Free/Beta can often mean periods without access, bugs as new features are built in, and potentially a nasty surprise if/when the makers decide to start charging for things. That's fine if you're just experimenting and doodling with an online video mail application, but if you want something stable and guaranteed (to apply pre-set curriculums or programs that students pay you for), then a moderate pay-for application like Eyejot is probably better (and remember, you can still use it in a limited fashion for free and your students probably won't need anything above the free service).
As I mentioned in the Screenr cast above, you can embed the Eyejot video recorder widget almost anywhere - including blogs - so if you'd like to leave a comment, ask a question, or just say a quick hello, please do so below!