Hi @bill I keep all the business cards I can. Keep them in a box. No really, they are however before they make it into the big box I enter them into my contacts (gmail). The amount of detail I enter depends who and what they do. The nice thing about gmail contacts is that it works pretty good with my iphone and when I enter notes about the person or what they do it also automatically search the notes. So if I'm looking for a drywall guy but don't remember the 5 drywall guys names I just search drywall and they all pop up. You can also make fancy groups if needed, plus many other options.
I'm sure there are better options for some out there however it works just fine for me and it's free!
Tip, also after I meet someone and I am back in the car or wherever I make notes of anything important on the back of the card and that gets entered also.
Currently have about 600+ contacts and and it hasn't slowed anything down at all.
I also do have a group for investors, agents, inspectors, painters etc.
-Ray
@Bill B.