ArcadeVGA
ArcadeVGA is a video card, that was made specifically for Windows, that allows people to use an old arcade monitor, typically using a 15khz signal.
Most modern PC's monitors consider 31Khz or higher signal, wich given problems with using in a real arcade monitor. Modern video cards typically disable 15khz to prevent users from being used by the driver. This may get this pretty hard to get this to work on a Arcade monitor (even with Advanced MAME).
ArcadeVGA supports many MAMEtm based resolutions, so you don't need any software scaling in most games. But some resoulutions may not work on your arcade monitor, so these may need to be disabled with a resoulution tool.
ArcadeVGA 2
There is now an updated version of the ArcadeVGA, the ArcadeVGA 2. Available in both AGP (based off the ATI Radeon 9250 chipset) and PCIe (based off the ATI Radeon X550, with 512mb of video memory) the ArcadeVGA 2 is capable of, along with the original 15khz resolutions, 25khz resolutions as well as PC resolutions up to and including XGA (1024x768). Additionally, it has dual outputs (one VGA, the other DVI - as well as S-Video, though this output isn't recommended by Ultimarc) which, along with the drivers on the accompanying disc, enable simultaneous dual-monitor support (though, the ports are specific: VGA port strictly for arcade monitors, DVI port for PC monitors).
