Gentlemen,
Here's more quality arcade game remakes.

Living Hell (splatterhouse)
Levels not identical to the coinop version, but still worth a try:
http://www.nlkgames.com/?section=game&id=112

Red Forces (Green Beret)
Faithful remake of Green Beret a.k.a. Rush 'n Attack:
http://www.youtube.com/watch?v=QtbwrTH45o4
http://red-forces.software.informer.com/

Typhoon 2001 (Tempest)
This one is a damn fine remake -- a must have
http://www.youtube.com/watch?v=xtCK1FChI3U
http://digiex.net/downloads/download-center-2-0/games/8785-typhoon-2001-tempest-2000-remake.html

Digdug Aftershock (Digdug)
Another fine remake. Faithful to the original while adding new features.
http://www.onlinegamesector.com/onlinefull/5808/dig-dug-aftershock.htm

Hydorah (Gradius)
This is more like a arcade shooter inspired by Gradius, but nevertheless a very fine game.
http://www.youtube.com/watch?v=lf5NaSPODtg
http://www.locomalito.com/hydorah.php

Have Fun!

Thanks for the links!

As a side note, Maldita Castilla also on the last site looks pretty great. I'll have to keep my eyes open for that one.