Yes, something this would be very useful for actually comparing the fonts. Google Web Fonts has something similar, you can select a bunch of fonts from the long

Yes, something this would be very useful for actually comparing the fonts. Google Web Fonts has something similar, you can select a bunch of fonts from the long list, that you like from first glances, and then compare only that selection with sample texts. For this list of programming fonts, I could first select (mark) a bunch that just match my general taste (shape, weight, x-height). Then I would be able to easily switch between my selection/shortlist to inspect more detailed differences such as how numbers are aligned with respect to brackets and operators, or whatever. Currently it's a bit hard to do if you have to keep a mental shortlist of fonts you like enough for further inspection, to remember which ones to check back on (especially if you see some names for the first time). Regardless, it's a really cool site, great resource, and already the comparing mechanism is pretty nice!