I've gotten Snow Leopard to install on my 1000HE, and it's actually easier to do than installing iDeneb or rfca's retail Leopard was. The Dell Mini community has really come through for the rest of us on this one. Here's what you do:
1. You need a retail Snow Leopard DVD. Just buy it, it's only $30.
2. Restore your retail SL DVD to an 8GB flash media of some sort (I used an SDHC card) using Disk Utility.
3. Download NetBootMaker from here:
http://code.google.com/p/netbook-installer/downloads/list Get the latest version, which as of now is 0.8.3RC1.
4. Run NetBootMaker on your current Leopard install (or any working Mac). It will ask you for a volume to patch, pick the USB device you restored the SL DVD to. It will create a patched install you can use to install SL.
5. Boot from your patched USB volume. Don't boot it from Chameleon, it will panic. Hit ESC at boot and pick the USB drive from the list.
6. I completely wiped my drive (EFI partition too) by running Disk Utility and re-partitioning the drive (still as single partition GUID). I just wanted to do this to make sure nothing was left over from Leopard. You probably should too. You made backups, right?
7. Install Snow Leopard. I disabled installing the language translations (I usually do this anyway) and only installed the common printer drivers, as I'd heard trying to install the printers/languages could cause the install to fail. This may be no longer true.
8. Now you have a full SL install on your boot volume, but no bootloader. Reboot from your USB device again. In the Utilities menu of the installer, you'll see "NetBookInstaller". Run it. Ignore the "unsupported" warning.
9. Uncheck everything but "Install Chameleon RC3" and "Install General extensions". The "General Extensions" are the graphics, bluetooth, trackpad etc. drivers, so you needn't worry about installing them.
10. Boot into SL. Everything should work except sound, speed-stepping and Ethernet. You can install the drivers for those (the same ones we've been using: VoodooHDA, VoodooPower, AttansicL1, etc.) using Kext Helper (I was not able to get installing them to /Extra to work).
I've only just done this, so I've not tested some things. For one, I'm not sure if we still need dsdt.aml for the lid, ACPI etc. stuff to work, if we do, rfca's should still work fine. Also, I've heard that people who have installed by running OSInstall.mpkg have been having problems, that way is not recommended, even though it will work, sort of. Anyone installing SL on an EEE100X/Mini/Wind/etc. should really do it this way.