Is there a way to print dining reservations from the WDW website easily? I couldn't find a way to do it...I guess I just wanted a summary sheet.
Easily... no.
Depending on which system you end up with (v1 "old" or v2 "new"), it differs as well.
If they are all showing up in the v2 system, you can copy and paste the text in the ADR boxes. Start at "Dining Reservations" right above the first one, click and drag until just before the other parts (bottom and right panels) highlight. Copy this and paste it into either Notepad or MS Word (or something similar). You'll have to do some formatting to make it a bit easier to read, but it works.
If not all (or none) are showing in the v2 system, you can do the above for the ones that are displaying and then you can retrieve the other reservations by using the prompt on the right. Click "Retrieve Multiple Reservations" until enough boxes show to fill out what you need. Fill out the information and click the button. When they come up, you should be offered with a box to enter an email address to have them all sent.
Unfortunately (and I have to add this to my new system summary), there is no way to directly send yourself the ADRs that display in the new system. You may be able to pull them up with the confirmation and phone number as well, and add them to that list. I haven't tried it though.
Now, since Disney does display the ADRs on one page tied to your login, they really should be able to make a "Print version" of the page that includes a simple HTML table layout without the excess graphics and colors. But, that may be too much thinking for the likes of their development team

.