Ask HN: Good, hosted mailing list service provider?

Hi all,

What are some of the good, and most commonly used mailing list service providers out there? I'm just needing something simple that I can throw on my "coming soon" splash page that will allow people to subscribe for future news and stuff. Mostly I need this to gauge interest in my idea prior to coding the whole thing. :P Ideally it'd be as simple as disquss, and just require me to drop some javascript on the page.

What have you all used?

Thanks!