ePostOffice [1] is an online control panel and inbox, allowing recipients to select how they'd like to receive communications [from participating senders]. It's in a limited pilot phase right now, but seems promising.
A final interesting tidbit: Swiss Post has a financial subsidiary called PostFinance which handles most of Switzerland's wire transfers. Most invoices include a (machine-readable) payment slip. OCRing that payment slip and importing it into PostFinance's e-banking platform seems like an interesting idea. The different divisions have begun to more closely integrate their services, and recently launched a large campaign promoting the variety of Swiss Post's offerings. We'll see how it goes.
[1] http://www.post.ch/en/post-startseite/post-privatkunden/post...