It turns out that I seem to be a very rare case of a straight male kuutsundere (a kuudere/tsundere hybrid).
One thing I've been enthusiastic about on Wikipedia are high-quality SVG images. Not things like logos, but graphics and art that you wouldn't normally associate or even think were possible with SVGs (such as photo-realistic objects and highly detailed & shaded art). Therefore, I'm going to keep a list of SVGs on Wikipedia that impress me.
A few can usually be found at:
http://commons.wikimedia.org/wiki/Inkscape#Examples
http://commons.wikimedia.org/wiki/User:Niabot
Also, Fate/stay night (the visual novel) is awesome.
Impressive SVGs
editWARNING - Unless your web browser is hardware-accelerated, rendering "Impressive-level SVGs" will probably make your PC crawl slowly!
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Anime Girl
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Dojikko2.3
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Comparison between Manga and Photo
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++ EXPLICIT ++ Futanari Hadako-tan
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Mahuri
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Playstation3vector
Moderately Good SVGs
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Eurofighter Typhoon
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F16 drawing
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TheStructorr Lamborghini Gallardo
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Manga colored
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Rubik's cube
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Tux
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Wikipe-tan full length
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Figure in Manga style
Other Misc. SVGs
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Anime eye