HD Textures look AWESOME.
So...
http://www.minecraftforum.net/viewtopic.php?f=25&t=21302
Install that texture pack. You open minecraft.jar using winrar, and the downloaded file using winrar, and you drag the contents of the downloaded file to minecraft.jar. Easy. Textures are installed.
Then you download this: http://www.minecraftforum.net/viewtopic.php?f=25&t=46173
You just run the patch and apply it. I used 128x128 option so it runs really smooth. Tick all the boxes. Apply the patch.
Don't choose "run minecraft" because otherwise you can't play online (since it skips the login part).
Just launch minecraft as usual.
The only thing I don't like is the signs. They've got a white paper over the wood. Everything else is very awesome. I would post pics but I'm off to bed.