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Most of these filters can easily be used in Video Enhancer which is a lot faster than VirtualDub on hyperthreading, dual core or multiple CPUs. (see comparison)
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Sharpening filters
Use these filters to sharpen your video (make it less blurry).

Adv. Warp-Sharpen flaXen
Sharpen the video using edge detection.

http://flaxen.edwardk.info/

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
De-Sharpen flaXen
Undo the effects of over-sharpening with an unsharp mask.

http://flaxen.edwardk.info/

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
MSU Smart Sharpen MSU Video Group
Enhance image sharpness with minimum noise amplification.

http://compression.ru/video/smart_sharpen/index_en.html

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
SMP MSharpen Alexander Nagiller
Original filter by Donald Graft - SMP Support integrated by Alexander Nagiller.

http://members.chello.at/nagiller/vdub/index.html

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
Unsharp mask Donald Graft
Contrast enhancement/sharpening using Adobe Photoshop unsharp mask.

http://neuron2.net/unsharp/unsharp.html

Works with Video Enhancer and VDFilter: No Download now!      (mirror)
msharpen Donald Graft & Andreas Ludwig
Spatial sharpening of important edges without amplifying noise. Designed for anime.

http://neuron2.net/msharpen/msharpen-vdub.html

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)
warp sharp Avery Lee
Sharpen edges in an image by warping pixels toward edge boundaries.

http://www.virtualdub.org/virtualdub_filters.html

Works with Video Enhancer and VDFilter: No Download now!      (mirror)
xsharpen Donald Graft
Sharpening effect that avoids amplifying noise by mapping pixels to the closest of window max or min.

http://neuron2.net/xsharp.html

Works with Video Enhancer and VDFilter: Yes Download now!      (mirror)