Audial is currently offering three DIY projects, available as kits and occasionally as unpopulated PCBs.

The one is the AYA II D/A converter. To learn more on this offer, as well as on AYA II DAC itself, please visit the AYA II DAC DIY page.

The other is the Module R, which is a voltage regulator for power amplifiers. To learn more on this item, please visit the Module R page.

And third is the Module LAB, versatile line level stage, and which can be used either as a buffer or as a stage with gain up to 20. Dedicated Module LAB page is here.

Please also note that, as of June 2008, Audial will provide support for DIY items also via dedicated area of DIYHiFi.org forum.
http://www.diyhifi.org/forums/viewforum.php?f=35