Relevant links for webOS on the HP Touchpad:
xda-developers - View Single Post - [webOS] The HP Touchpad Guide (to homebrew/overclocking)
Pretty good getting started guide.
[webOS] The HP Touchpad Performance Tweaks Thread - xda-developers
Tweaking for performance and smoothness
Updating to Preware 1.8.3
Installing the new Preware
(1.8.3) to get beta feeds (oc kernels). If you update to 1.8.3 Preware, you'll need to do this.
[webOS] The HP Touchpad Guide (to homebrew/overclocking) - xda-developers
Tweaking/overclocking (See new Preware above)
Testing Feeds - WebOS Internals
Installing overclocking kernels (some experimental) (Dated material. See new Preware above)
[webOS] [GUIDE] Overclock the HP Touchpad to 1.9Ghz - xda-developers
Overclocking... (See new Preware above)
[HELP] Screen stuck on USB symbol - xda-developers
Hard reset - press power + home button
Recovery mode - power + volume up
webOS Doctor can repair problems with webOS and return you to stock.
The latest webOS Doctor file for the Touchpad
All versions: WebOS Doctor Versions - WebOS Internals
Back to stock
[webOS] [GUIDE] Unbrick the Touchpad - xda-developers
Back to stock/unbrick your Touchpad
[Guide] Factory condition restoration / Downgrade to webOS 3.0.0 - xda-developers
Another back to stock guide
Mods/Guides: feel free to update as needed.