Right, I've got it successfully installed; but I haven't so much experience on MT, so I've no idea how to make the thing appear on the site template, which I thought installation would automatically do. I'm not exactly a programming noob but I am an MT one. So any assistance of any difficulty is appreciate.
Reported on Movable Type 4.3

You'll have to make a widget which uses the linkroller tags. I believe linkroller uses the asset tags for most of its work if that helps.
Hi Mike,
Indeed the LikeRoller plugin uses assets to manage the links.
It created a new type of asset called "link".
Songun, follow the sample from the plugin page. Later, you could learn about filtering link assets by tags, if you would like to display multiple blogroll widgets, each with its own links.
Kind Regards,
Mihai Bocsaru
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I would recommend LinkBox instead. It's substantially better for generating complex blogrolls.
Why would you prefer LinkBox, Mike?
We're talking about the plugin from:
https://github.com/movabletype/mt-plugin-linkbox
What I like about the LinkRoller plugin from:
http://plugins.movalog.com/link-roller/
Is that when you want to add a link, you provide the URL and then the plugin automatically extracts the META TITLE and adds it as link title and the META DESCRIPTION and adds it as a link description. You could edit both, obviously, but it is quite nice to get them automatically filled in.
Haven't tested the LinkBox plugin, yet.
Kind Regards,
Mihai Bocsaru
I've managed to implement a very basic link asset template with the help of the limited documentation available (virtually limited to a whole comment in the comments section of that article on movalog.)
So where exactly can I learn of code to implement filtering these link assets by tags? That much wasn't too clear.
At present, my widget simply adds links and no more, and it requires refreshing for each link asset added.
The filtering could be achieved by assigning tags to your link assets and then using this syntax:
<mt:assets tag="middle-east" type="link" sort_order="ascend">
Where "middle-east" is a tag sample...
The static publishing requires you to republish the whole site for seeing changes to a site-wide widget reflected online.
You could combine the static publishing with php includes or ssi includes in order to avoid republishing the whole site, or you could first add all your links, and then do a single full site rebuild/republish.
Kind Regards,
Mihai Bocsaru