Here's a few links to websites relating to cells:

http://www.biolessons.com/lessonplans/cellularbiology/plant_animal_cell/plant_animalcell.asp

This website contains differences between animal and plant cells.

http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/A/AnimalCells.html

This website is all about animal cells and more about it.

This a useful picture of an animal cell:

http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/P/PlantCell.html

This is about plant cell with a lot of extra information.

This a useful picture of a plant cell: