Early Learning Resources

[Ayla]

Kinder Art (http://www.kinderart.com)
Enchanted Learning (http://www.enchantedlearning.com)
Kiddies Games (http://www.kiddiesgames.com/en/preschooler_games.php#alphabetbang)
Poisson Rouge (http://www.poissonrouge.com)
Up to Ten (http://www.uptoten.com)
Starfall (http://www.starfall.com)
Global Garden (http://www.global-garden.com.au/gardenkids.htm)
Reading Eggs (http://readingeggs.com) (free until mid-September using this code DRF35XLP)

[Beatrice]

:bump As ever, please add your own :D

Universal Preschool (http://www.universalpreschool.com/) (a curriculum and activities, also lots of articles on the impact of over-emphasising academics at this age)
The Idea Box (http://www.theideabox.com/) (activities, games, recipes; seasonal and holiday themes)
Kid's Craft Weekly (http://www.kidscraftweekly.com/index.html) (newsletter and archives)
The Write Start (http://thewritestart.typepad.com/the_write_start/) (gorgeous photography and lots and lots of ideas for introducing children to pre-writing skills)

These are a bit more schooly, but even so there are some good ideas for activities, and for occupying younger children when older kids want your attention.
Paula's Archives - preschool activities (http://www.redshift.com/%7Ebonajo/preschool_activities.htm) (shoeboxes or ziploc bags for pre-prepared activities to whip out at a moment's notice - very useful! Also links)
Ideas for activities (http://www.geocities.com/Athens/Aegean/3446/keeplittleones.html) (a school-at-home focus, including "trayning" kids to sit through an activity, music player on page)