Bill Newell has kindly shared some Google Sketch-up files on volume and cross-sections that he has created.

Google Sketch-up is a free 3-D drafting and geometry tool that can be downloaded from:
http://sketchup.google.com/

The files have been zipped, so you will need to unzip them before you can your them.

Drag each time to the correct rectangle above the clock. There are five times given in each puzzle. Stop the clock when you have finished. Can you beat teh best time? There are six levels

Level 1 - half hour intervals
http://www.oswego.org/ocsd-web/games/StopTheClock/sthec1.html

Level 2 - 15-minute intervals
http://www.oswego.org/ocsd-web/games/StopTheClock/sthec2.html

Level 3 - 5-minute intervals
http://www.oswego.org/ocsd-web/games/StopTheClock/sthec3.html

Level 4 - 1-minute intervals
http://www.oswego.org/ocsd-web/games/StopTheClock/sthec4.html

Level 5 - 1-minute intervals
http://www.oswego.org/ocsd-web/games/StopTheClock/sthec5.html

Level 6 - time is given in words
http://www.oswego.org/ocsd-web/games/StopTheClock/sthecR.html

A range of activities to help students understand analogue clocks. What time is it 15 minutes from now? What time was it 5 minutes ago?

http://www.oswego.org/ocsd-web/games/ClassClock/clockres.html

Stop the clock when the time on the analogue clock matches the time given in words. How many points can you earn in 10 rounds?

http://www.oswego.org/ocsd-web/games/BangOnTime/clockwordres.html

An angle is given. Put the monkey on on the circle at the point that you think matches the angle. The closer your estimate, the more bananas you win! How many bananas can you win in 10 rounds?

http://www.oswego.org/ocsd-web/games/bananahunt/bhunt.html

Changing the Border
This is a nifty puzzle whose solution is based on the area of a triangle. The land is divided into two parts (P and Q) by the border ABC. Redraw a straight border line passing through point A so that each of the areas does not change.
http://www.ies.co.jp/math/java/geo/tochia/tochia.html

Dividing a Quadrilateral
This is a more challenging problem that is based on the same underlying concept.
http://www.ies.co.jp/math/java/geo/shi2to/shi2to.html

Clockwise
Either enter a time and see it displayed on the analogue clock, or click on 'Random' and type in the time shown on the clock. There are three difficulty levels.
http://www.shodor.org/interactivate/activities/ClockWise/

Elapsed Time
Practice finding elapsed time given a starting time and an ending time.
http://www.shodor.org/interactivate/activities/ElapsedTime/

Practice estimation skills by determining the number of objects, the length of a line, or the area of a shape. Choose the problem type, or choose 'Random' to see a mixture of all three types of estimation questions.

http://www.shodor.org/interactivate/activities/Estimator/

Type in your birth date (and time, if known), and this website will calculate your age to the nearest day (or hour, minute or second depending on how accurately you know your birth time).

http://www.mathcats.com/explore/age/calculator.html

Click on two cards to turn them over. If they match, they are cleared from the board. If not, they remain on the board. How many turns will it take you to clear the board?

http://www.interactivestuff.org/match/maker.phtml?featured=1&id=12