I'm obviously confusing everyone here, so I'll try to clarify. What I want is for the following scenarios to be possible:
1. After a hard-day's work, I log on to an ftp server which is purely used for storing files (like iDisk) and I send my work to the server to back it up, so that in the horrifying event that my house should burn down, at least my clients won't be unhappy.
2. I have an urgent job to send to my printing house. It is too large to email and they don't run their own ftp server, couriers cost too much and cds are wasteful. I log on to my own server, send up the files, and they then log on to the same server with details I provide them, and download the files to their system.
On a pc, you can use IE6 to access ftp servers. If there is something that comes as standard with the mac that allows the same, then I don't know about it so please tell me how to find it!

I understand that I can use Transmit or a similar client to set permissions on, say, a folder on my own web server which could be used in a similar way, but I don't really want to use my web server for backing up and sharing files, and besides I don't think my current plan offers anything like the amount of space I'll need for back-up purposes.
What I would like is a dedicated ftp server that acts only to serve the purposes described above. I've seen inrterfaces whereby a user can access the server via a web browser, so that they don't have to download their own ftp browser to access files. I think this would be ideal for what I want.
So my questions would be:
Are there dedicated ftp servers available to hire for the purposes I describe, or do I just get a regular hosting package and use it for back up?
Does anyone know of any software that allows a user to access ftp via a regular web browser (mac or pc)? Or, perhaps there's something that comes with osX that I can recommend my mac clients use to download files?
Whilst I'm perfectly capable of using google, I like asking questions here because I want opinions on the best way to do this sort of thing and the best software to use.
ps. I know iDisk is available but it's a bit troublesome for pc users to access.
Any help, as always, very greatly appreciated.