HTML
>> Lissa Explains -- The basics of HTML plus some more stuff. A bit hard to navigate though. I suggest searching for what you need.
>> Funky Chickens -- Weird layout and not a lot of codes. Plus the codes are hard to copy.
>> HTML Goodies -- The more advanced HTML help. I learned positioning from here.

Javascripts
>> The Javascript Source --Not much difference between them. They're just ones I like.
>> The JavaScript Kit
>> Javascript.com

Images
>> FreeFoto.com -- Not a lot of photos, but well organized.

Earth Sky Water Fire -- A lot of photos, most of them wallpapers.
>> Spin Wave -- Use this to optimize and compress your GIFs and JPGs. You have to be a member of Spin Wave first.
>> Pure Cuteness -- Get cute graphics in the you section along with a few photos
>> Heart To Me -- Original graphics by Sana

Resources
>> Websoup Resources