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p.s. i now keep a backup memory card with all my saves on it
I have 5 memory cards - all official Sony ones - and have never had a problem.
I did have one freebie, unbranded memory card from the cover of the first issue of PSW magazine, and that got corrupted twice, so I binned it.
I have heard stories of game-saves being corrupted on PS2 cards, but as far as I know, this was to do with the use of the DVD software, which on Japanese consoles must be loaded onto a memory card. However, this is not necessary on UK models, so I don't think there'll be a problem.
p.s. i now keep a backup memory card with all my saves on it