various sources, including:
http://www.the-earchives.com/
http://www.dosdesign.dk/02multimedie/07audio/slideshow/websounds.htm

1 - can opener
2 - machine
3 - dropped garbage can
4 - applause
5 - applause
6 - airplane taking off
7 - wind
8 - wind
9 - wind
10 - surf
11 - surf
12 - surf
13 - surf
14 - surf
15 - water
16 - thunder
17 - applause
18 - typewriter
19 - crash
20 - skidding tires
21 - thunder
22 - splash
23 - spark
24 - scissors cutting paper
25 - machine
26 - motors
27 - saw
28 - ratchet
29 - camera
30 - motorcycle
31 - motorcycle
32 - dropped ball bearing
33 - engine starting
34 - kiss
35 - jet flying past
36 - engine revving
37 - gun
38 - glass breaking
39 - glass breaking
40 - glass breaking
41 - glass breaking
42 - thunder
43 - flare gun
44 - file cabinet drawer opening
45 - file cabinet drawer closing
46 - explosion
47 - explosion
48 - explosion
49 - drill
50 - creaky door
51 - coughing
52 - squeaking glass
53 - biting celery
54 - chainsaw
55 - fire