Free Twitter reposting and tweet Scheduling Applications and Tools

The group I founded, PMlessonsLearned.com, has a twitter account (@PMlessons). We're looking for a way to schedule "tweets" in advance.

Here are some links I found helpful:

Slide presentation with good comparisons of a bunch of free tools:
http://www.slideshare.net/theduffyagency/090930-8-prd-twit-scheduler-pz-sh
And the blog post relating to this slide presentation:
http://blog.theduffyagency.com/methodical_madness/2009/09/index.html
Covers: Tweet-U-Later.com, Twaitter, Dynamic Tweets, Twit Robot, Future Tweets, Social OOmph, Twuffer

Blog post on 6 twitter tools that schedule tweets for later:
http://shegeeks.net/6-twitter-tools-that-schedule-tweets-for-later/
Covers: Twuffer, Futuretweets, Twaitter, twit Robot, Hootsuite, Cotweet


http://understandyourniche.com/twitter/twitter-tools-to-schedule-tweet
Covers: Tweet Later, Future Tweets, Tweet Deck, Twuffer, Easy Tweets (paid), TwitResponse,
Hoot Suite


http://inspirationfeed.com/design/2010/05/18-tools-for-scheduling-future-tweets/

http://www.tripwiremagazine.com/2010/05/18-twitter-tools-for-scheduling-future-tweets-and-improving-your-social-networking.html


http://internet.suite101.com/article.cfm/6_free_tweet_schedulers


http://inspirationfeed.com/design/2010/05/18-tools-for-scheduling-future-tweets/

http://holywebmaker.com/my-favorite-twitter-tools-588

Others:
http://seesmic.com/


I liked hootsuite and socialoomph so googled a comparison:

http://www.simmons.edu/reconnect/2009/09/social-oomph-vs-hootsuite-which-is-better-for-you-to-manage-your-twitter-communications.html

http://ezinearticles.com/?Should-I-Use-Social-Oomph-Or-Hootsuite-For-Automation?&id=3884622

Looks like socialoomph.com might be the place to start.
I won't get to this for a while, so please give your input!