I didn't want to hijack the existing thread on the use of SD and SDHC cards with a 50g, seeing as how they are fairly different. But this observation seems relevant to some of the things said there:
I had, at separate times starting several years back, a 128 MB and a 64 MB SD card in my 49g+ and in both cases, the calculator took so long to turn on, times reaching up to a minute, I began to suspect there was something wrong with it, or that the last ROM update killed it. And when it finally turned on, use of the card was not easy at all, as it took a long time to navigate as well.
Then I recently bought a new camera and it came with a 32 MB card. I switched that into the 49g+ and it powers on instantly! Searching the SD card in the calculator was also now actually fast enough to be of use. I wish I had been able to procure a smaller capacity SD card much earlier.
I suspect however, that 32, or 16 or even 8 MB for that matter, is really all a HP calculator user could ever need, even if he collected many of the user created programs out there in HP calc-fandom.
Now I fear that with my aging CPU (Athlon 64 skt 754), if I get a bigger hard drive, I'll need a week to find files... imagine if my old brain got more cells for memory; I'll remember everyone I meet, what I had for lunch each day for ten years, and remember to drop off the mail or pick up some milk... a month later.