The HP TouchPad is launching tomorrow with a new version of webOS. HP has decided to give back to early webOS adopters by giving them a discount on the company's first webOS tablet.

Through July 31, if you have proof of ownership of a Palm Pre, Pre Plus, Pixi, or Pixi Plus (initially in the US or Canada), you can get a $50 rebate on the purchase of a new 32GB TouchPad. The mail-in rebate is good wherever you buy your TouchPad, including preorders and reservations.

When we learned last week that HP was giving its employees a 20 percent discount on the tablet, we pointed out that this was rather low, especially given that some companies give their employees new tablets for free. This deal is also disappointingly cheap, but for webOS lovers, I guess it's better than nothing.

The HP TouchPad is a 9.7-inch slate (1024 x 768 resolution), powered by a dual-core 1.2GHz Qualcomm Snapdragon APQ8060 processor, 16GB or 32GB of built-in storage, 1GB of RAM, HP's Beats audio, a micro-USB 2.0 port, Bluetooth 2.1+EDR, a front-mounted 1.3MP camera, as well as a light sensor, gyroscope, accelerometer, compass, and GPS (3G model only). It measures 242 x 190 x 13.7mm and weighs around 740g. The device is running a WebOS 3.0 with true multitasking, Flash 10.1, a paneled e-mail application, a pop-up notification system like Growl, Skype support, wireless printing, calendar and e-mail integration via HP Synergy, as well as compatibility with Amazon's Kindle ebook store, Google Docs, QuickOffice, and more.

Optional accessories (sold separately) for the HP TouchPad include the HP Touchstone Charging Dock, the HP TouchPad Wireless Keyboard, and the HP TouchPad Case. These are expected to be priced at $80, $70, and $50, respectively.

Preorders for the Wi-Fi version of the HP TouchPad in North America and Europe have already begun, and that the US release date is slated for July 1, 2011. The device will be available from US retailers, commercial resellers, and direct from HP with the option of either 16GB ($500.00) or 32GB ($600.00) of internal storage. HP's first webOS tablet will be available in the UK, Ireland, France, and Germany a few days later and in Canada in mid-July, with availability scheduled to follow later this year in Italy and Spain, as well as in Australia, Hong Kong, New Zealand, and Singapore.