Say hi to our newest member, QuartzRaven!
Orpheus
omegaslayer
+ tags and easy searchability.Yes it has this, you can search your files.
+ company/website is not likely to go out of business or lose my files.Drop box is by far the most popular
+ good/fast user interface to upload/tag tons of files without wasting a lot of time clicking around menus for each file.It has a minimal interface, no ads. The web interface allows you to select multiple files to upload at once, although theres probably a cap on it. If you download the program it provides you with a virtual folder that you can drop your files in, then the drop box program will upload all files on there to "sync" it with the online folder.
+ encryption/privacy/security. The documents would include things like my tax records, medical records, etc, so I don't want some random hacker (or the government) going through it.I don't know the exact encryption, but your files won't be able to be accessed by anyone but you or anyone with your account information. You may also set certain files to be public if you wan't to share files with someone.
+ enough space for many thousands of images.You can get 2GB free, then if you refer a bunch of friends they'll give you a max of 8GB. (250mb for every friend)
+ browser based (so i can use it on any computer without installing software).Yes, it provides you with a clean interface.
+ integration with stuff like a personal wiki/calendar/etc (less important)..I don't know about a wiki, but it does have an events area. You CAN set up your own website with the pubic options.