18 
This is the latest Wei-Hwa puzzle:
What is next in this sequence?
15, 16, 17, 21, 23, 30, 33, 120, ?
The answer's in the comments.
[08:24][comments 1]
5 
This is the latest Wei Hwa puzzle that can be seen on google personalised homepages.
Drag the letters into the rectangle so that words read both across and down. Purple letters only move up-and-down, while green letters only move left and right. Click and drag a colored letter to move it. You win if four five-letter English words read left-to-right along the rows and five four-letter words read down along the columns.
For answers see comments.
[15:12][remarks 1]
10 
Here's a puzzle based on Erich Friedman's "Distance," from the 2003 Google U.S. Puzzle Championship. Label 14 of the circles above with different numbers from 1 to 14, such that the distance between 1 and 2 is less than the distance between 2 and 3, and so on. Four circles should remain empty.
Note that this image is not part of the solution but just an example.

See comments for solution.
[02:13][have your say 1]
4 
If a tree falls in the woods because of a wound, then what little object will not hear the sound?
A Why Me Rhyme is a pair of words that look like they should rhyme (after all, only their first letter is different), but don't really. For example, depending on the colorist, Etrigan could be considered a lemon demon. See if you can figure out these twelve Why Me Rhymes from their descriptions:
What is heard when your little girl is having fun
A disgustingly dirty sticker
A siesta for weirdos
A friendly rejection
Lists of all sorts of animals to be eaten
An unrefined crucifix
A type of bar bet, maybe?
Makes a news agency irrelevant
Stamps that someone refuses to return
Makes contact with feminine hygiene products
A price reduction given only to certain noblemen
Newer style of patio furniture
See comments for answers. Click here for puzzle #1.
[09:46][comments 3]
28 
Those with a Google homepage may have noticed a section called "Wei-Hwa's Puzzle Challenges." The first came out on Friday:
Using the numbers 3, 3, 8, 8 (in any order), make a mathematical expression that equals 24. You can use only addition, subtraction, multiplication, and division (and parentheses), but in any order you wish. Note that you have to use all four numbers; otherwise 3 times 8 would be valid -- and that wouldn't be much of a puzzle, would it? Stumped? Look in comments for the solution.
[09:21][remarks 4]