Comment Not illegal, but perhaps detrimental (Score 1) 223
The "border search exception" has been well vetted legally: http://en.wikipedia.org/wiki/Border_search_exception
(Note that the ACLU's implication that this exception extends to 100 miles from the border is incorrect: http://news.yahoo.com/does-constitution-free-zone-really-exist-america-195813138.html)
But I would guess this search exercise does more harm than good. It can be easily circumvented (encrypted data over networks), so the question is empirical: Have criminals adapted to the law yet, in which case it becomes useless, and detrimental to the innocent (mostly for psychological reasons, but also for practical reasons if the government were to abuse the info it obtains).