tradebit

The fastest way to sell files hosted on Dropbox! With this plugin you will get:
<ul>
<li>a free Paldrop merchant account (for up to 10 registered products)</li>
<li>an integrated button in your admin panel to fire up the member area</li>
<li>a sidebar widget, that links with your ID to paldrop and lists your products</li>
</ul>
Paldrop.com is the standard way to sell files hosted on Dropbox and gives you 
access to millions of legal digital goods that you may additionally add to your 
blog.
Read more about the <a href="http://www.paldrop.com/" title="Downloads" rel="nofollow ugc">Paldrop features</a> 
here. The current version provides English accounts and will be enhanced to 
other languages down the road.

PalDrop Dropbox Shop

PalDrop allows you to add a simple and fast payment button for your Dropbox files! It combines your Paypal email with your Dropbox account and enables …

Vadym

Extra User Details is the simple plugin that allows you to add extra fields to the user profile page (e.g. Facebook, Twitter, LinkedIn links etc).
Extra fields can be easily accessed in your templates like a general wordpress author details:
<pre><code><?php the_author_meta('meta_key'); ?>
</code></pre>
Plugin saves fields data in wp_usermeta table. You can add and edit extra fields at plugin options section in backend.

Extra User Details

Took me a bit to get this out, since there is no help online.
I wrote a little function and pasted it into my functions.php:
function extra_user_info() {
		global $current_user;
			get_currentuserinfo();

		echo 'Your extra user info is' . $current_user->PUT_YOU_ID_HERE ;      		

	}

add_action ('NAME_OF_HOOK_WHERE_YOU_WANT_IT', 'extra_user_info', 20);


How to display the correct values in the frontend

Add extra fields to the user profile page, saved in WordPress' native way (in wp_usermeta).

PalDrop Dropbox Shop vs Extra User Details