Just as a disclaimer, I've served as a beta tester for the 2.0 incarnation of this app, and I've chipped in for a donation when this app was freeware.
Personally, I realize that a lot of people see the new price as overly expensive, especially since more powerful apps like SOHONotes only cost $10 extra. I've actually given the developer my opinion on this that he might do well to lower the price.
However, some other competing shareware apps that I can think of off the top of my head bracket Scribblet 2's price as well; ShoveBox is $25, and Snippet and CheckOff are $13. Given that Scribblet does a lot more than Snippet and CheckOff (in the context of usage as a general purpose note taking/management app), and does somewhat less than SnoveBox, I think $20 is a reasonable price, since the developer himself provides an excellent level of support for Scribblet; he's also very open to feature requests too.
Additionally, I'd also hasten to mention that the last freeware version of Scribblet, 1.5.1 (which continues to work well for 10.6 and 10.5 for me) is still available from the developer here: http://www.not-salad.net/scribblet/files/Scribblet_1.5.1.zip - also, he's given out free 2.0 licenses for all of his donors, no matter how much they've donated.