Hybrid Connect – WordPress List Building Plugin – The WP plugin that turns any WordPress website into a List Building Machine. Easily create opt-in forms, lightboxes, slide-in boxes and squeeze pages with the world’s most flexible editor and use the split-testing feature to reach the best possible conversions for your site. Fully Compatible, Tested and Working in All Major Browsers and Mobile Browsers:
Integrates with every mailing list service and includes Facebook connect functionality as well as a brilliant “Hybrid” feature which shows a Facebook connect opt-in to anyone logged into Facebook and a standard opt-in to anyone who isn’t.
Even just the fact that Hybrid Connect covers both sidebar or post optin forms and lightboxes means a major advantage for you. Usually, you need to combine two separate plugins or scripts to cover those two functions. And good luck trying to get matching designs from two different products. Not to mention you have to pay for two products instead of one…