I have made some of these for my personal forum. They are just ideas and have popped a few responses.
Wikipedia Tag:
Just input the /wiki/{Text To Search} between the tags and it creates a Wikipedia link that opens in a new tab/window.
Code:
The BB Code
[wikipedia]{TEXT}[/wikipedia]
HTML Code:
<!-- The HTML to replace and use with the link. -->
<img src="http://forum.decafproductions.com/images/wikipedia_favicon.png" alt="Wikipedia Favcon" title="Wikipedia Article on {TEXT}" /><b> : </b><a href="http://en.wikipedia.org/wiki/{TEXT}" target="_blank">{TEXT}</a>
I would suggest that you change the forum.decaf.... to a relative URI on your server to quicken load performance.
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Google Search:
The same idea as the Wikipedia only this uses Google. I would suggest that other search engines be used for equality.
Code:
The BB Code
[google]{TEXT}[/google]
HTML Code:
<!-- The HTML to replace and use with the link. -->
<!-- The colors should/can be changed to match with Google's official colors more accurately. -->
<a href="http://google.com/search?q={TEXT}" target="_blank" title="A Google search on {TEXT}."><b><span style="color:#0000FF;">G</span><span style="color:#FF0000;">o</span><span style="color:#FFFF00;">o</span><span style="color:#0000FF;">g</span><span style="color:#00FF00;">l</span><span style="color:#FF0000;">e</span>:</b> {TEXT}</a>
Just Some ideas and they can be viewed
on my forum.