I've been looking for a component to combine WHMCS and Joomla for some time as it's a pain getting people to register more than once and requiring them to login multiple times. The J!WHMCS Integrator allows users to register or login just once and they're logged in to both Joomla and WHMCS. It matches your header and footer for your website without using an iframe (which can cause problems with some WHMCS payment gateways) which allows total integration so you don't have to run WHMCS in a separate window. This component might at first seem expensive but in my opinion it is well worth it if you want to allow your users to login to both your website and billing/support system. Also the support from Steven has been exceptional, he took time to explain how to fix problems I had and released updates for the product within hours of raising a support ticket.

This product is really worth it if you use WHMCS on your Joomla website!

Having the poll results display in the module rather than a new page is a much better idea and this module does exactly that. I'm using the jLPoll_V1.3b version and I had a few minor issues to match my template and to remove the rounding from the result to make it slightly more accurate but this module is definitely worth using instead of the default Joomla one.