
As 0.4.x has just become slow, and lacking in fun for me I've restarted development of the 0.3.x series as Minetest Classic. All of these servers run Minetest Classic, but can still be played on (with some unknown blocks) with an old 0.3.x client.
Main Server
Address: minetest-classic.com
Port: 30000
Privs: shout and teleport, ask me for build; either here, on irc.freenode.net #minetest-classic, at the Minetest Classic Forums, or on the server.
Public Server
Address: public1.minetest-classic.com
Port: 30001
Privs: shout and build.
Creative Server
Address: public1.minetest-classic.com
Port: 30002
Privs: shoutt, ask me for build; either here, on irc.freenode.net #minetest-classic, at the Minetest Classic Forums, or on the server.
New features in Minetest Classic, not found in 0.3.x (everything except the new blocks, and 3D models work in original 0.3.x clients):
Cotton: craft from 4 junglegrass
5 Tree Types: oak, large oak, apple, jungle, conifer - each with their own saplings, wood, and leaves
Plant Growth: junglegrass and papyrus grow naturally
Apple Growth: apple trees grow apple blossom, which grow into apples
Border Stone: protector nodes, these stop players other than the owner digging/placing nodes within a 5 node radius.
Leaf Decay: because leaves hanging in the sky are ugly
Apple Drop: apples drop to the ground once the leaves are gone
Farming: place mud next to water, dig it with a shovel and it becomes farm dirt; can be used to grow papyrus, cactus, junglegrass, roses, daffodils, tulips, cotton, wheat, carrots, potatoes, beetroot, grapes.
Rat Death: rats die in lava
Stairs and Slabs: 7 types of each, as well as the upside down versions.
Stone Blocks: a more polished stone block, made from regular stone.
Stone Bricks: kinda self explanatory.
Glass Light: a clear light source.
3D player models: and 3D mobs.
Dyes: 8 colours that can be used to colour glass, glass slabs, glass panes, cotton, carpet, beds, clay, and probably other stuff I've forgotten.
Roofs: a proper roof draw type that allows for sloped roofs with neat capping and corners.
And a whole lot more.
With several hundred node types and crafting recipes, I took the easy way out, rather than keeping track of all the recipes I just made an in-game craft guide (there's also cooking, and decrafting guides, but you can get the recipes for those from the craft guide):

The source, as well as precompiled binaries for windows (thanks to Menche's awesome build script) of Minetest Classic are available at the Minetest Classic Website.