If you are a beginner and want to try any rocking email marketing software, MailChimp is for you. You don’t have to even use your credit card to use MailChimp  as you can get it for free (upto first 2000 subscribers). But the pricing becomes much more than AWeber once you start getting more than 2000 subscribers. So it again depends on your website email marketing needs.
One thing that one must not forget is also integration with your existing website. If your running on Joomla, WordPress, Drupal or such likes, better you find how the user integration will go with your CMS and one of those email services. You don’t want the client to have to register for your autoresponder on one form and then have to register a second time for your website! You may find that plug-ins to do such things might restrict your choice, check it out first or consult with your webmaster!
In closing I signed up with verticalresponse.com and in 2 sec I had an email from the CEO with her photo and a phone number to call if I had any support related issues, and no joke, in literally 10 min I had built my mailer and sent it out to 8500 customers – they did not hold it for a while, or send just a few test mails; it was done and sent and reported on in less than 30 min! MailChimp.com take note: That is how you do it! (reports not bad either)

“The biggest reason that it was so bad was because of the size of your list. The Infusionsoft coach that we had highly recommended not using the AWeber to Infusionsoft import tool, and so we exported the lists from AWeber and then uploaded them into Infusionsoft. In theory, that wouldn’t have been bad—in fact, I had initially been looking forward to it. I like working in Excel.
A lead magnet (a.k.a. an optin bribe) is something amazing that you give away for free in exchange for an email address. This doesn’t have to cost you anything to create; most lead magnets are digital materials like PDFs, MP3 audio files, or videos that you can create yourself at minimal or no cost. It can be absolutely anything you want, so long as it provides value to your visitors for free.
Promote up-sells/cross-sells. You can even set up an autoresponder sequence for someone after they purchase and get repeat customers. Depending on the products you sell, you could offer an upsell, or cross-sell related products. For example, if someone buys a digital camera, you can offer to add a lens, a tripod, and other accessories to their order before it ships. Or, if you sell products that people buy frequently (like food or disposable items, like diapers), you can automatically send them offers for new items when you know they’re about due for another order.

Now you have created your first email list using Mailchimp, and it’s time to grow your Email list. Obviously, we will be designing the Email signup form in the next step, but first it’s a good idea to import your existing subscriber list to MailChimp. MailChimp supports all major services like Feedburner, salesforce, Eventbrite, Zendesk and many more. Importing from Feedburner to Mailchimp is easy, and you can refer to this guide which will help you to get started. Do remember, your list is free for first 2000 subscribers only, so if you are exceeding the list, you need to start paying.
There are two great things about Mad Mimi. First: it's very cheap. Second, it's very easy to use. These two factors may convince users to purchase a plan. However, some users will find that there are some noticeable omissions when it come to more advanced functionality, particularly in the autoresponder and split testing department. - Chris Singleton
AWeber has a lot to offer, especially to companies that frequently utilize autoresponders. The autoresponder series set up was among the most intuitive and simplest I’ve ever seen…and of course, once your series is set up, you can allow it to run in the background with no further actions on your part. The WYSIWYG editor has some nice features and recent updates have improved the email design experience significantly. The analytics and reporting capabilities are a step above par, as is AWeber’s number of integrations.

Most of the editor’s shortcomings are image-related, even for basic functions like cropping. You can resize an image, but that’s it. In addition, getting at the HTML and CSS is a bit of a pain. It can be done, but you’ll need to save your message as a template, then edit it as a template, save your changes, then start a new message using that template. It works, but you’ll waste a lot of time clicking and scrolling.

You see, the people on your email list are your best customers.  They have visited your site and found it interesting enough to subscribe for more content.  For that reason alone, they are much more likely to listen to any offers you may send them (affiliate promotions, product sales, discount coupons, etc.).  So, having a large email list can actually be quite profitable, which is why bloggers and website owners hold them in such high regard.