i can't seem to be able to upload any images to my site now, they've been optimized for web in photoshop and all used to upload extremely fast, now they hang. i think i might possibly be near my host's limit (100 megs of space), would this cause it to happen? how can i find out how much space my website is using?
any other ideas as to why i can't upload anything now?
any info would be greatly appreciated.

Hmm, no idea why they won't upload anymore.

But to find out how much web space you're using up, ask your host. Also, if you were provided with an online administration panel, odds are there's a feature that will say how much disk space and bandwidth you've used up. Who's your host?