No, I can't unfortunately. Too many apps rely on web backends that have been upgraded and are incompatible with the versions that run on iPad 1. For example, the built-in YouTube application on iPad 1 is completely non-functional. Also, the newer iCloud features require you to "update" your iCloud to a version incompatible with the old iPad.

Many older apps have now also been pulled from the store. My iPhone 1 can only reinstall Skype from an old iTunes backup, but not from the store.