Basic Question...Sorry

I've a Canon S3 which, in the instructions says in Movie mode it can film for 1hour or 1Gb.
Is 1Gb the limit? i.e If a buy one of the new 4Gb SD cards can I film only up to 1Gb or can I film to the limit of the card ?

I think 1gb is the individual file limit. so, theortically you could put 4 1gb movies on your card. I didn't think the 4gb cards were compatible with Canon s series.

One gig is the limit per movie. The length of the movie depends on which resolution you have it set to. Higher resolution is about 9min and low is something like 45min. Both equal 1gig.

Some people do use 4 gig cards for movies only, I wouldnt recomend using one for pics though. Too easy to loose ALOT of pictures due to a card error. I stick to 2gig max for pics.

I was at a concert last Friday and took some video in High res with my SD700. Figure on about 100mB per minute and you won't be too far off. After the 1gig is filled up the camera saves the file and then you can continue shooting. I wouldn't even bother with the Low res, the quality is not really acceptable (for me anyway). My S2 works the same. From everything I've read I would stay away from 4 gig cards. I'm with Thomas on cards, I carry 2 giggers.