What we really like about Twelve South's new BookArc for iPad ($40): this silver steel iPad stand feels every bit as solid as its earlier, larger version for MacBooks, includes two rubber inserts for use with unencased and encased iPads, and pitches itself as capable of letting iPads either stand upright or on an angle as you prefer. The rubber tips on the stand prevent it from scratching your desk or table, and the $40 price is $10 less expensive…