Working with French knots is different from working in cross-stitch or petit point in that it is easier if you have both hands free.  I've been working on the Bees and Trees rug without a lap frame, and it's hard not to start hunching forward as you work, balancing the hoop on your lap and completing each knot...not at all comfortable for long periods of time.

I bought a Baby Z Lap Frame since some fellow stitchers were talking about lap frames recently (here's the link to the vendor I bought from, but they don't show a photo of it).  Though the instructions for assembly were minimal, it went together easily enough.  I did have to sand it in a few rough areas, but all in all the quality is good.  It's a solid frame and has a base just 11.5" wide, so it is a comfortable weight and width for me.

It has a tray in the base for holding yarns and scissors.

Plus, it is adjustable in height, folding relatively flat for transport.

My beautiful chair...it's like stitching in a fast car.  Aw, yeah.  :D

So far, I really like the frame.  It will definitely save being hunched over while stitching.  The knobs on the clamp do get in the way a bit and I was going to try putting them on the bottom side with the set screw, but the way the clamp is designed, it isn't an option.  So, I'll just have to get used to them or get a shorter set screw and put that side up instead.  :]

Update: As requested, here's a photo of me sitting with the frame.  :]  Right now, I am working without the set screw and with the knobs of the clamp facing downward until I can get to the hardware store for a shorter set screw.