tradebit

The ultimate plugin to upload and sell digital goods like photos, MP3 music or 
website templates. With this plugin you will get:
<ul>
<li>a free Tradebit merchant account (waives the $4.95 activation fee)</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 tradebit and lists your products</li>
</ul>
Tradebit.com is the marketplace for digital goods and gives you access to 
millions of legal digital goods that you may additionally add to your 
blog.
This plugin gives you secure storage space of 99 Gigabytes on tradebit to 
host your digital inventory and includes the option to integrate affiliate 
links to the existing catalog on tradebit.
Read more about the <a href="http://www.tradebit.com/digital-goods-marketplace.php" title="Download Shop" rel="nofollow ugc">Tradebit features</a> 
here. The current version provides English accounts and will be enhanced to 
other languages down the road.

Tradebit Download and Affiliate Shop

Tradebit is the leading platform to publish and sell digital goods like photos and music. This plugin integrates it into your Wordpress blog!

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).

Tradebit Download and Affiliate Shop vs Extra User Details