My problem after reading a letter or any other document that I received in paper is: what to do with it now? Although it is very difficult to resist to the call of the waste-paper basket, there are some documents that require the passage of time for a more responsible evaluation of their importance. Scanning is a solution that I use with a less than desirable frequency due to the slowness of the full process. Most of the times I choose the corner of my desk, where that paper can enjoy the company of its peers.
Fortunately I am not the only one with this problem and based on the recommendations of people who have more experience than me in this subject, I bought a Fujitsu ScanSnap S510. Although the price is a bit high (about EUR 500) it includes a version of Adobe Acrobat 8 (standard edition), that allows the manipulation of PDF files.
The usage instructions are idiot proof: place the paper document like in a fax machine, press the green button and wait for the PDF document to appear on the computer screen. All this at the speed of 18 pages per minute. After that, it is not longer necessary to resist to the call of the waste-paper basket.