$12256 / $11500
This may be more work than you're willing to do but I thought I'd suggest it.
When previewing an image it would be nice to have a 2x and 4x button to make small images bigger. Since there are a lot of tileset images there is a good deal of detail that is hard to see unless you download the image and zoom in to see it up close. If there were a button next to close that allowed 2x and 4x zoom it could save some effort downloading and previewing locally to see if a tileset really looks how you want before costing you the bandwidth.
Just a suggestion. I know it was addressed here already but figured it was worth mentioning again:
http://opengameart.org/forumtopic/ideas-for-features-and-changes-to-oga
This website's content is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.
I would like this too, it's a feature built into the forums at Pixelation where you click to make it bigger and shift click to make it smaller. Often what I end up doing here is dragging the image into some image editor so I can look at it better.
I'll look into possibly adding this, although I can't make any promises it'll happen in the short term. Maybe the ability to use the mouse wheel to zoom in and out of preview images?
I usually get the image "plain" into a new tab, so I can use my browsers zoom. What I dont like about it, is the blurring filter. There is a proper term for it, but I mix them up all the time, guess you know what I mean.
Personally I would prefer a zoom that renders pixels as solidcolored blocks with crisp edges.
I know at least some browsers have a way to do that, which is why having a built-in zoom on the site would be good. There's no way to turn off that filtering when you view the image on its own (as far as I know, anyway).