lo-fi - keeping it tidy - thoughts ?

I’m implementing GTD using mainly lo-tech, ie, all my Next Actions, Projects etc are listed on 5x3 index cards (stapled together by category - ie, all NA@home cards together etc).

I just cross out items when done but the cards tend to look a bit messy after a few weeks (my dodgy handwriting doesn’t help !), to the point where it gets tricky to scan through them efficiently.

I did think about transferring everything onto Remember The Milk then I could just print out legible lists every now & again (and keep it lo-tech by crossing out / writing on them) but I think they’d only print out on A4, I’d rather have them on A5 at the very most.

Any thoughts re keeping things a bit more user friendly ?