Great thread-- I had the same idea but luckily found this one before I began a new thread.
I use either Microsoft Word or OpenOffice to create .rtf or PDF files for:
1: Flight information and confirmation codes (to be able to print out passenger passes at the hotel).
2. Trip itinerary - including "travel guide" information about sightseeing, places of interest, etc.
3. Recipes - (although I keep the my reader far away from the stove and other places where accidents can occur).
4. RSS feeds - through Feedbooks, I get personalized "newspapers" downloaded so that I get blog updates, photography tips, weather, etc.
5. Church info - on Sunday mornings, I usually download the appropriate readings so that I can read along during mass. I have also downloaded the common prayers used during mass.
6. Meeting itinerary and minutes - I am a member of several boards and if they send out the minutes of the past meeting and the upcoming meeting's agenda, I put those on my 505 and take that to the meeting.
7. Speech notes - if I am giving a presentation or speech, I will often put my notes (in VERY LARGE FONTS) instead of taking up note cards.
In general, I will put things on the 505 instead of printing. Alot of times, I would print information out, use the information, and then end up with a lot of scratch paper. Now, I only print if I have to give the information to someone else. If the information is for me, I put it on my 505.
I use my 505 for many day-to-day activities. In fact, I almost use my reader for more things than for reading books.