I'd like to add that there are certain tips and tricks to getting more out of the search bar.
As you know, this site uses a Google Custom Search bar as MrHub mentioned. Normally, you just type a word or words in the bar and hit enter. But sometimes, the results are too many and you'd like to perform a more refined search.
Well, since it's a Google search engine, it means you can use the Google searching operators and shortcuts to modify your search terms. Here are just some:
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Exact phrase
"" - Use quotes around your search terms to search for an exact phrase. In order to be included in the results, all words must be present and in the exact order they were typed including spaces. For example...
Searching:

Results in:

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Exclude words
- - placing a dash in front of a word will EXCLUDE it from your search results. For example...
Searching:

Results in entries that have "Magic Kingdom" but WITHOUT Castle:

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Wildcard
* - placing an asterisk between 2 words will find items that have both words and something in between. For example...
Searching:

Results in entries that have "Roy O. Disney", "Roy Oliver Disney", or "Roy L. Disney" or "Roy M. Disney" if there were any.

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Forum only!
This is an interesting one... As you know, when you search, forum items as well as articles and anything else on WDWFG come back in the results. If you want to search forum posts ONLY, then this trick is for you. Basically, you use the "inurl" command to tell the search engine to search results that have a certain word in the internet address (or URL). All forum posts here have the word "forum" in the URL. So...
If we use "inurl:forum" and then our search word, it will ONLY search for entries in the forums. For example:
Searching:

Results in entries containing the word "photo" that are in FORUMS ONLY:

Articles only!
Likewise you can search Articles only by doing this:
Search:

Results in items containing the word "photo" that are ARTICLES ONLY:

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Titles only!
Similar to the Forum and Articles, you can search titles only by using the "intitle" modifier.
If we want to search for the word "photo" in the title only, we would search:

Results are the word "photo" in the title:

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Text only!
Similar to Titles only, you can search text only by using the intext: modifier. This will search for the word in the text portion only.
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Combining search operators
You can combine various operators to further enhance your search. For example, searching:
inurl:forum intitle:Magical
will search in the forum only for a thread title containing "Magical".
That's all I can think of for now. Hope that also helps a bit! 