Here are some Haskell logo i made. I hope webmasters will use it to spread Haskell. I hereby release it into public domain.
The official logo is at haskell.org.
For the horizontal version, it is also possible to display it without using image, by using HTML, unicode, fonts, stylesheet. Here's the code and how it displays in your browser:
<div style="display:table; border: solid thin black; text-align:center; padding:1ex"> <span style="font-size:large; font-family:sans-serif; word-spacing:2ex">λ → ∀ ≫ :: ⇒</span><br> <span style="font-size:xx-large; font-family:serif;">Haskell</span>
You should also add the Unicode declaration right after the “head” tag in your HTML:
<meta http-equiv="content-type" content="text/html; charset=utf-8">
If you have a question, put $5 at patreon and message me.