These have been working quite well for me:

Work contexts:

1) @PC 2) @Telephone [Although most calls are made from my desktop, I find value in a separate phone context, if only because of the momentum created by making that first call. It’s a different mindset for me, and I can blow through a list in short order… once I make that first call.] 3) @Office [This encourages me to live away from my computer upon occasion. For example, it’s refreshing to brainstorm ideas on paper instead of continually basking in the phosporescent glow of the one-eyed beast. My eyes thank me, too.] 4) @Waiting For 5) @Agendas [The specific people vary by project cycles. I typically have 3-6 at any given time.]

Home Contexts:

1) @Home 2) @PC - Home 3) @House/Auto [This is for home improvement and auto maintenance. Even though this stuff is technically at home, it typically requires a different context such as putting on grubby clothes and going outside.] 4) @Waiting For 5) @Agendas 6) @Errands

And I do it all using some Word-based 3x5 card templates I ginned up after being inspired by reading Emory’s compelling white paper a few months ago. (The HipsterPDA templates were a bit too cluttered for my taste.)

Emory’s paper: http://kvet.ch/pages/gtd-whitepaper-emory