Custom categories as open-source?

Though Bento and Delicious Library are both essentially database applications, they are meant to serve completely different purposes. While Bento provides you with templates to build your own database, DL2 gives you a very structured way of importing information from an existing database. Of course we could add more customizable features, but that would also make it less convenient and easy to use. Plus, the more options we add, the more it becomes like Bento-- and why make another Bento-like product if Bento is already out, and works great? I guess you could then want something halfway between Bento and DL2, but I think that's what Bento was supposed to be... the easy/consumer-level version of FileMaker.
Having such a close spectrum of options is something you can more easily find on the Windows platform because of the market saturation. But I think the more you get, the more you compromise quality. So while being caught between DL2 and Bento may be a tough decision, at least you'll be choosing between two awesome products instead of five sketchy ones.

Cfasa: When I refer to DL2 being convenient, I mean it in the way that it doesn't require you to manually enter in the information as Bento would require.
The reason that items are categorized incorrectly is because as Amazon builds its database, their own categories tags change sometimes to accommodate more specific categories, and then DL2 gets confused when it sees an item with the different tags. For these things, we try to keep an eye out for what starts getting mis-categorized (such as the Nintendo Wii recently) so it doesn't keep on getting dumped into the wrong shelf. However, if things do end up in the wrong place, you can easily change their category by editing the "item type" category in details.
I only brought up the stuff with windows, because some of the applications on the other side are infamous for throwing in tons of unjustified features and really messing up the user interface because of it. This is not to say that your feature requests are unjustified-- I think an "Others" category is completely reasonable and a definite possibility for the next version of Delicious Library. We just like to very very carefully consider every feature we add because (1) If we implement a new feature, we want to think it through all the way and make sure it's right for the program and (2) Once you add a feature, you can't really take it away. You had mentioned Bento in your post, which is meant to work for WAY more stuff than DL2, and I didn't really know how much "customization" you wanted before.
Luckily, adding customizable tags is something we are planning on doing in the future, it's just going to be a big database change within Delicious Library and for our iPhone app. There's more brainstorming going on with that idea, and it will most likely be a feature in DL3.
I understand if you may disagree with some of the things I said. I wasn't trying to pick an argument or anything, but just try to explain why we aren't going to go in the direction of Bento.

Sam: We continually add features to the program (added a lot in DL2) and of course we plan on doing the same or DL3. It's still in a very conceptual phase right now, as we are trying to do more with the iPhone (and hash out the bugs in DL2), but we are always open to ideas for the future version. It doesn't all go as fast as some people want, since we only have one engineer working for the company right now, but we work on this stuff every single day, and read through hundreds of feature requests every week. There are a lot that we like, and a lot that would be cool but wouldn't work in our program. While listening to the customer base is always a good thing to do, adding *every* requested feature would ultimately end in disaster. We want to keep people happy, but there will never be something that will be 100% loved by everyone. Because of that, we try and do what *most* people will like, and hope that is enough!

Let me know if you have any other questions/concerns to raise, and I will be glad to respond.