Nebulous Notes is great in that it's a regular plain-text editor. It sees the entire structure of my Dropbox folders, and accessing any plain-text file from Dropbox is super-fast thanks to Nebulous Notes navigation options. You both get a long list of recently edited plain-text files, as well as the ability to browse all Dropbox folders.
I have set up files like
scrap.txt,
scrap2.txt,
scrap3.txt,
scrap4.txt,
scrap5.txt, etc., inside my Dropbox, so this essentially gives me a multi-item, multi-platform clipboard.
One more huge advantage of Nebulous Notes: it properly supports Unicode-encoded files. I find that many iOS text-editing apps fail to support UTF-8 properly, so that when transferring, say, non-English texts between iOS and Windows, these get mangled. Not in Nebulous Notes -- it preserves the correct encoding and formatting 100%.
A drawback of Nebulous Notes is that it does not handle
very long plain-text files very well, freezing from time to time (and I mean thousands of lines here).