Most wikis require you to perform one of two contortions to create a link:
- Use CamelCase. Much like a camel, this is robust, but tiring to finger.
- Wrap things in [“symbols that are hard to type”].
In both cases, you need to know in advance that you plan to create a link, and be enough of a disciplined philistine to overcome the effort and overlook the ugliness.
Auto-links are the solution  – here’s how they work. Say you create a page called ‘Camel case’. Now, type Camel case anywhere else, and that ‘Camel case’ text will be turned into an auto-link as you go. In other words, the wiki notices that you’ve typed the name of an existing page in the midst of your text, and automatically creates a link for you. If you go back and edit the text, the link goes away. 
Links between pages become evident to readers without any extra effort on the part of the writer. If I type ‘MySQL’ and an auto-link appears, it’s easy to see that a relevant page about it already exists.
Having used such a system for a long time, I have come to appreciate the tiny flash of satisfaction at seeing a link appear with no extra effort, confirming that the page does indeed exist , and making navigation while editing a breeze. Pages that I wrote years ago are now festooned with links to pages that were created long afterwards. Indeed, the most satisfying feeling of all is when an auto-link pops up to a page I’d forgotten I wrote. Lazy serendipity!
 To do this the way God intended requires running a regex containing all the pagetitles in your wiki over what you type on every keystroke – this is very nearly instantaneous for even 10k documents.
 For extra points, allow pages to have multiple aliases, so that (for instance) ‘database’, ‘databases’ and ‘MySQL’ all point to the same page.