Distribution of Scrabble word scores

If you take each word in /usr/share/dict/words (OSX 10.5) that is 7 letters or fewer and can be created with the standard set of Scrabble letters, and calculate its simple value in Scrabble, then the histogram of the data looks like this.

1 | 10
2 | 52
3  | 240
4       | 753
5             | 1541
6                         | 3061
7                                       | 4744
8                                                   | 6220
9                                                             | 7462
10                                                         | 7043
11                                                    | 6439
12                                           | 5276
13                                 | 4061
14                        | 2959
15                 | 2078
16              | 1713
17        | 979
18      | 714
19    | 414
20   | 255
21  | 171
22 | 90
23 | 47
24 | 32
25 | 22
26 | 5
27 | 6
28 | 3
29 | 1

The most valuable word? "jackbox".