I've just uploaded this article on my site, but I figured I'd also share it here. I will try to add at least 10 new seeds every week, so make sure you check the webpage if you want any new seeds.

You can also submit your own seeds by visiting our forums at http://forum.minecraft-guides.net and I'll add it to my site (with credit to you).

minecraft-guides.net

Of course I had to test my website url as a seed and it turns out to be a great seed. You spawn in a plains biome, near a small village, but the best thing is the enormous desert biome. It stretches far beyond twice the view limit with the render distance on far, which makes it perfect for any desert themed build.

Sugarcane

A survival island seed. You spawn on a tiny island with even smaller islands next to it. There's 1 stalk of sugarcane growing on the main island and 1 tree on the smaller island. How long can you survive?

Moving mountains

This seed spawns you in a forest and near a nice, sandy shoreline. Perfect for any sea side town or beach party.

Delete

This seed will spawn you on a massive (survival) island. There are only 6 trees on this island, but there's a lava pool which could be useful for fuel or cobblestone and there's a cave system which is exposed on the surface.
This island is also great for any island build, but if you're looking for a large, empty island to build your town on, why not check out our custom island.

Mooshroom

This seed spawns you next to a large village, which included a blacksmith. The chest inside the blacksmith contains 7 obsidian, iron legs, 5 iron ingots, 3 bread and 1 apple, which is a great boost for anybody starting a map.
The village is situated on the edge of a large desert biome, as well as a plains biome and near a jungle biome.

Leave blank

You spawn inside a jungle biome with large hills and an open cave inside one of the hills, right next to a small lake. This is perfect for primitive style builds or other jungle style builds.

Ender dragon

You spawn in a nice world with a shallow lake, perfect for clay harvesting, as well as many rivers, a ravine reaching to layer 44 and a tiny village with a weed field.

Random seed

This seed will spawn you inside a large forest. There's a small lava pool nearby, as well as sugarcane growing near a shoreline.
This seed is perfect to start in when playing on survival.

I give up

This seed spawns you in the middle of an ocean biome, perfect for underwater builds or large ships.

5914108218770005895

Another survival island. You spawn on a small island with a single tree and a few exposed iron ores. How long can you survive?