I often find myself looking for different Popstation threads and finally figured that someone should organize them. So why not me? Anyways, I hope this helps, gets stickied, and gets updated.
Simple Popstation GUI (Image, save and title support) (v.0.7)
http://www.dcemu.co.uk/vbulletin/showthread.php?t=47763
Yet Another GUI for Popstation v1.0
http://www.dcemu.co.uk/vbulletin/showthread.php?t=47416
PSX2PSP v0.7: a new converter for PSX games
http://www.dcemu.co.uk/vbulletin/showthread.php?t=47238
Smiths' Popstation Front 1.2.2 - No, Really this time...
http://www.dcemu.co.uk/vbulletin/showthread.php?t=47334
popstation for Linux and Intel Mac OS X
http://www.dcemu.co.uk/vbulletin/showthread.php?t=47333
DCEmu official guide - how to install 3.02 OE-A, then to OE-B, to run PSOne Games
http://www.dcemu.co.uk/vbulletin/showthread.php?t=47121
Popstation Icon_Sound pack.
http://www.dcemu.co.uk/vbulletin/showthread.php?t=47529
DCEmu Dark Alex/Popstation Compatibility List
http://www.dcemu.co.uk/vbulletin/showthread.php?t=47123
PopStation Icon and Picture thread
http://www.dcemu.co.uk/vbulletin/showthread.php?t=47122
Pixelstation web site: popstation backgrounds and icons - highest quality
http://pixelstation.pixelreview.net/
If there are any that I missed please tell me. I will try to add the new threads as new Popstation related things are made but I might forget so if you want to remind me that would be fine.