Direct to Garment (DTG) t-shirt printing is pretty much the norm for online custom t-shirts retailers these days. Companies like Cafepress and Zazzle officially dropped the heat press for DTG printing recently and Spreadshirt has also increased their DTG printing. You can watch one in action in this video and even rock out to some wild music that plays with the video.
The DTG printer in the video is a Kornit 932D and if you are a real geek you can check out the specs on the printer over at arttrend.com.
http://www.artrend.com/digital/kornit932D.html
that printing operation looks great, but expensive. how much does that printer cost?