From Google’s acquisition of Writely coupled with Google Spreadsheet comes Google Docs and Spreadsheets. A hosted, Gmail-like service which provides (you guessed it) a hosted document and spreadsheet editor.

Just login with your Google/Gmail account to get started.

All your documents are in a nice, clean, hosted centralized location allowing you, or colleagues to access them from anywhere. You can even upload existing doc(Word)/rtf/xls(Excel)/csv etc documents to the repository.

The collaboration stuff really is nice. Send invites, track revisions, chat (IM-like, right in the window) while you work together on a doc, etc. (It’s similar to Writeboard only with richer collaboration tools). You can also invite folks to view, but not edit.

You can also export your creations to common formats (doc/rtf/xls/csv/pdf/html/open office). PDF export is a pretty darn cool feature.

Has a very nice spell check.

The spreadsheet (doc too?) allows you to autosave periodically to keep you from losing work (nice touch).

You can also post word docs to your blog (nice clean drop-down+click setup for Blogger, WordPress, LiveJournal, SquareSpace, BlogHarbor, Blogware). And you can manually set up other services, including TypePad and Moveable Type, but it takes a bit more finessing.

Works in IE and FireFox (haven’t tested others, although I suspect all modern browsers work.)