Capturing notes and information is an essential function on a Tablet PC and there are a couple of well designed applications available that alone almost make having a pen-enabled Tablet PC worth it. I switch back and forth between Microsoft's OneNote and EverNote and just received a press release announcing EverNote Portable and the public availability of the beta version of EverNote 2.0.
EverNote Portable 2.0 beta is available as a free download. EverNote Portable now allows you to install EverNote on a USB flash drive or other removable media like an Secure Digital card. I plan to load it on my USB drive so I can take EverNote and use it on my work and home PC without having to install it on the local drives. The Portable version is equivalent to the free version of EverNote and there is a couple of limitations due to the portable nature of the application and the lack of using Windows registry entries. The Portable version does not include EverNote Web and Email Clippers, links between notes and external applications, EverNote databases will not be automatically associated with the EverNote application, and you need privileges to write to the Windows Temp directory.
If you want to get the full functionality out of EverNote, then you should try the EverNote 2.0 beta. The Plus version of EverNote has a price, but the 2.0 version is available now as a free beta for 90 days. After 90 days, EverNote 2.0 Plus will revert to the free version. The Plus version of 2.0 includes Advanced Note Recognition (ANR) technology with Advanced Image Recognition (AIR) technology. The AIR technology allows you to search photos and graphics stored in your notes to find embedded typed or even handwritten text. The technology looks simply amazing and I recommend you check out the AIR page for more specific details and a couple of examples. Their Universal Clipper also looks unique and powerful and I will definitely be trying out EverNote 2.0 soon. You can buy EverNote 1.5 now for US$39.95 and get a free upgrade to 2.0 when it is released.