I've noticed this as well. A while ago he lamented the fact there was nothing more to write about (i forget the exact post, article it was in) having got everything off his chest about software & software development (old skool desktop mainly). But don't despair. I think a lot of the stuff he's pump(ed & ing) out is ahead of the curve. The articles are what you need to know a bit further up the line. Not as useful in the immediate as when you expand beyond survival mode.

What do you do when you need to know about

- design an office ~ http://www.joelonsoftware.com/articles/BionicOffice.html

- learn about management skills ~ http://www.joelonsoftware.com/items/2006/08/07.html

- why writing is essential ~ http://www.joelonsoftware.com/articles/SortingResumes.html

- larger picture ~ http://www.joelonsoftware.com/articles/DevelopmentAbstraction.html

- how to ship physical things ~ http://www.joelonsoftware.com/articles/HowToShipAnything.html

"... Useful software written above the level of the single device ...." Jeff Stutz wrote this on leaving Microsoft ( http://www.synthesist.net/writing/onleavingms.html ). I view JOS, "useful advice written above the level of a startup".