Sign up for free trials to see which email marketing tool you consider easy to use. Their prices vary. MailChimp and MoonMail are the great ones to start with if you don’t have a big mailing list. They offer a forever free trial if you have up to 2000 contacts. Some of the other popular brands are GetResponse, Active Campaign, AWeber, Constant Contact, and many more.
I suppose the secondary reason I haven’t made the switch is because I run multiple blogs and don’t want to get stuck paying multiple fees at this point. (I’m under the impression I’d have to pay separately for each email list, but please correct me if that’s not the case. That would change things.) I love the functionality and features of Aweber, but I can’t see paying 4-5 monthly services fees while so many of the blogs are in a start-up phase.
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I am not signing up for an account so I don't know exactly how the API works, but if I were setting up an iPhone App to work with this, I would use the rails plugin. Rails gives you JSON communication for free (IE no extra work required) http://guides.rubyonrails.org/layouts_and_rendering.html see section 2.2.9. Then use on IOS app use something like: http://code.google.com/p/json-framework/ to interact with that.
Finally, you can optionally include “automations” with your broadcast. Automations are a simple way to automatically add or remove tags when your subscribers do certain actions, like open the email or click on specific links. Adding and removing tags are important when creating segments, or subscriber groups, and triggering automated email campaigns.