User:Nintendo Maniac 64
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:
Also, Fate/stay night (the visual novel) is awesome.
WARNING - Unless your web browser is hardware-accelerated, rendering "Impressive-level SVGs" will probably make your PC crawl slowly!