To make a link to another card in Wagn, just put the link between double brackets. For example, [[Wagn]] gives you this link:
Wagn
You can even link to a card that doesn't exist yet. The link will show up red, and anyone can just click on it to create the card. So [[I don't exist]] results in:
I don't exist
Links to plus cards work the same way. [[Wagn 0.13+blog]] gets:
Wagn 0.13+Blog
If you want the text of the link to be different from the name of the card it's linking to, you use a vertical pipe after the link, followed by the text. So [[Aaron Nelson|IT hero]] shows up as:
IT hero
There is a great deal more power possible with Wagn's internal links. See web address for everything and setting default content with links.
Any web address you enter will automatically become a link:
http://grasscommons.org/
Again, if you want the text of the link to be different, you use double brackets and put a vertical pipe after the link, followed by the text. [[http://www.grasscommons.org|Grass Commons]] results in:
Grass Commons
If you want to use double brackets without creating a link (for example in documentation), put a backslash just before the double brackets. For example, \[[this isn't a link]] appears as:
[[this isn't a link]]