I believe 8gb but there may be more in testing.
I believe a 16 gigabyte memory card is the highest memory limit. Though, I believe your PSP needs to have a somewhat recent update in order to use these bigger sized memory cards.
Year before last. There are now 32 GB cards available.
Digital cameras usually have external memory cards that can hold many picture files. There are different types of cards with different memory sizes ranging from 2 gb to 64 gb.
I think 16 GB memory cards are the largest.
It has 4GB internal memory - BUT - is capable of using micro SD memory cards fro expansion.
Seeing as you can use any Pro Duo sized memory card, I am pretty sure that the highest amount of memory for a psp memory card is 32, i have not seen any higher. In fact, it even says on wikipedia, "The largest capacity Memory Sticks currently available is 32GB."
The new psp GO has internal memory of 16 gb, but the other versions of the psp, 1000, 2000, or 3000 use memory cards only.
The Nikon CoolPix takes SD or SDHC cards. The largest right now (August 2009) are 32 Gb cards though it appears that Toshiba are launching 64 Gb SDXC cards soon and 128 Gb and on up to 2 Tb cards are planned for 2011.
I would purchase two 2 GB cards. That way you can take a lot of pictures, but you aren't putting all your eggs in one basket. Cards do fail. 4 GB cards are nice, but some older card readers will not recognize them. You should be able to get around 400 image files on a 2 GB card at highest resolution and fine setting.
You can get up to 16GB in most stores. There are 32, 64 and 128GB memory cards, but they are very expensive or not in mass production yet. The 32 GB cards are now more available and it is lowering prices on smaller cards 2011, I just ordered a 128 MB cardm on amazon today. So things are improving.
16 MB SD Cards usually cost about a dollar, but like more than 16 GB would be like $30 or so. And there are 1,000 MB in one GB.
GB means gigabytes, a unit in measuring memory size. If you are referring to Nokia N95 8GB, 8GB represents internal memory. So you will have the storage capacity of ten 800MB CD's right from the box without the need of buying extra memory cards.