Don't be shy, there are tips from reminders about commands to complex autolisp routines, and everything in between (yes, there is even some VBA code). If you are looking for a routine, you can also find almost 10 years of previously published code at http://cadtips.cadalyst.com. What if you are having problems with some existing code? Drop into the one of the many forums out there, including Augi, CadTutor, and of course the Hot Tip Harry forum at Cadalyst, and ask some of the pros.
If you have been around AutoCAD for a while and have done any Autolisp or VBA programming, you have probably run across a great Autolisp and VBA site with tutorials and code examples named AfraLisp. About 4 years ago, the Afralisp website, created by and formerly maintained by Kenny Ramage was taken over by David Watson, who also runs http://www.CadTutor.net.
If you are planning on upgrading to AutoCAD 2008 32-bit, and you have existing LISP, VBA, or ARX programs, will they work? Generally speaking, yes. You may have to make a minor adjustment to your code, but for the most part there shouldn't be any problems.
If you are working in the VBA editor and are frustrated because the scroll button on your mouse does not scroll, then pick up this freebie called FreeWheel and drop it in your Windows Start Menu in the startup group. Read more about Wheel scroll in VBA editor
If you need the ability to launch a PDF file from a menu macro, lisp file, or VBA routine, check out the code shown below. This will launch the PDF using the default registered application, just as if you had entered the file name in the Windows Start-Run dialog
This avoids any browser related issues which can arise if you use the AutoCAD "BROWSER" command.