There are so many small EDC knives, and I think I've bought most of them. I heartily agree with the recommendation of the Al Mar Mini Sere 2000 and the Spyderco Techno. You might also look at the Spyderco Sage 1, which is beautifully finished. The Techno and the Benchmade 755 MPR are sub 3" but are "little big knives." Both are great knives but a little bulky and heavy for EDC. The Spyderco Sage is also a little bulky, but not heavy. I'm not sure the SERE can be easily disassembled and cleaned, but of all I mention it is the best finished and makes the most confidence inspiring sound when it clicks open.
Benchmade makes a slew of knives fitting your requirements, the best being the Mini Stryker Axis. The only problems with Benchmades are the Axis lock which most people adore, but can cause problems if the internal springs break (which they do) or the knife gets too filthy, and the fact that they cannot be taken apart for cleaning without voiding the warranty. Plus, Benchmade will charge you $25 to put it back together if you take it apart and can't get it back together yourself. One of my friends took apart an axis knife and said it will never happen again.
As far as I am concerned (and more than a few will loudly disagree), the best sub 3" EDCs are, or were, made by Emerson. I personally like the Mini A-100, because it doesn't have the "wave" feature, which although extremely cool, might scare those who are nervous about knives. I believe that Emerson may have recently discontinued this model, after many years of production, but they can be found on the internet. Another Emerson which may also have been discontinued is the Micro Commander, a good beefy knife. Finally, they still make the CQC Mini 7, which is now available with either a tanto or drop point blade. This may be your only alternative if you want a smaller EDC knife, and it is a great knife. Emerson knives are extremely ergonomic, and far more durable than most other brands. They are simple to take down, clean, lubricate and adjust. They just keep getting smoother with each tear down.
