Several years ago, a shutter lag of over a second was common.
Now you can find digital cameras with a shutter lag of 0.1 second. And that is about as fast as it gets for now.
Here are some that reviewers have tested and reported to be 0.1 second:
Canon SD550, SD600
Casio Z50, Z55, Z750, S600
There may be more, but they have not be reviewed yet.
There are more cameras with a reported 0.2 second shutter lag:
Canon SD20, SD30, A430, A530, A540, A610, A620, SD450, SD430, SD630
Casio Z57, Z850
Kodak DX7440, DX7630, Z740, Z730
Sony F88, W1, P100, N1
There are high speed memory cards:
A high speed memory card will not improve shutter lag.
A high speed memory card may or may not improve continuous shooting ability.
A high speed memory card may improve start-up time.
That is the time it takes from the time you turn on the camera until it is ready to take photos.
A large size memory card will likely increase start-up time, as most cameras check the card during start-up.
DSLR (digital single lens reflex) cameras get the most benefit from high speed memory cards. That is because the camera itself is faster.
I think the delay between pressing the button and getting the picture is the worst part about digital cameras. I want a small, portable camera for snapshots with 3-6 MP.
Shutter speed is my most important factor.
What are the variables? A salesperson said that their are "high speed" memory cards available for Canon and Sony. True?
Does the size of the memory card matter?
Thanks for the tribal knowledge