The other thread got closed because people were posting emails asking for Gmail invites. So NO posting emails on this link.
One other rule. Don't just post a list - post why they are the best.
Here are mine.
BeWeather - Blows away Beautiful Widgets. Has High Definition videos of current weather. Has great forecast, choice of multiple radars, links to weather underground, has a very similar widget as BW but it's just way better overall. This replaces every weather app you have.
K9 Mail - Has been as still in the best mail app for all Android phones. More options than you will ever use.
Handcent - Same as above... except for instant messages.
Business Calender Free - I put the 4x4 widget up on one screen and have it display the month, it actually says what the appointments are on the days. And I set it so if I tap it, it goes to Agenda view which is very useful. Allows you to edit appointments and make new ones very easily. The best I've seen.
Pulse - An RSS news program - it has an AMAZING amount of options for news. Most of the places I use on my computer are in there and it has thumbnails of pictures. Very fast and you can use your browser to read stuff any time you want. I just got it and am still playing with it but so far so good. The widgets are good but they need to make a full screen one.
Boat Browser - I tried all the others first because of the stupid name. It turned out to be the best one so now it's my default. Fast, easy to use and stable.
Words For Friends - I am addicted. Play scrabble against anyone over any time period.
Screebl - Another must. It keeps the phone on when you are holding it and turns it off when it senses you put it down. For some reason the battery sensor thinks it's using 97% of the battery but I think it's a bug in the battery application since it shows how much time it was used but not how much battery.
The Moto Blur Contact Widget - It comes with it, you can put your 4 favorites with pics at the top and pull down a list. I would have paid for it.