Twitter has exploded; more and more users are joining and finding new ways to stay connected to the service 24/7. Here are over 29 Twitter resources for you and for your  iPhone.

1. Tweet a file

Tweetafile brings an important email functionality to the simple world of Twitter – attachments. Through Tweetafile, Twitter users can send any files (images, PDFs, Docs, videos… whatever) to all of their followers or via direct message to individuals.

2. Remember The Milk

If you use Remember The Milk to manage your tasks, you can do so via twitter using this app. Add Remember The Milk as your twitter friend and simply DM to add or interact with your tasks.

3. Twittonary

If you are new to twitter, some of the words twitter users use can be quite confusing. Get help from a twitter dictionary and learn the “twitter lingo.”

4. Twonvert

140 character limitations at times can really hold you back. This app converts your text into SMS shorthand language and allows you to say more with less characters.

5. Twist

Allows you to see “hot trends” on twitter. You can also use the search box to see what people are saying about a particular thing and how much buzz it is creating.

6. WhosTalkin

Although this app isn’t specifically for twitter, it is a very useful twitter tool. It allows you to search conversations that you are interested in. This helps you interact with like minded people or the whatever subjects interest you at that point in time.

7. TweetWhatYouSpend

Manage your spending online using twitter. Create an account and use Twitter’s “DM” feature to send tweets. You can export a spending journal later as an Excel or CSV file.

8. TwitterJobSearch

This service allows you to find job postings on twitter. If you are looking for a “web design” gig, simply enter web design to see what jobs are available related to web design.

9. Twiddeo

Upload videos to Twiddeo from your camera phone while on the go. The service then generates a link and posts it to twitter for your friends and followers to see.

10. TwitterCal

This tool connects your twitter account to your Google calendar. You can add events to Google calendar from twitter by sending direct messages to gcal.

11. TwitterFeed

Twitterfeed helps you send your Blog RSS feed or atom to twitter and also lets you track the number of clicks your feeds are generating.

12. PollDaddy

Create polls and post it directly on twitter. This can be extremely valuable when you are researching a subject or need user feedback.

13. LinkBunch

Due to character constraints, it can be quite hard to send more than one link in a tweet. If you need to send multiple links in one tweet (example : a post that has part1,2,3…), this service can be useful. It collects all links and gives you one shortened link that you can post on twitter.

14. Tweetdeck

One of the best desktop twitter apps out there. Tweetdeck helps you sort your friends and followers in groups and also helps you manage replies, DMs and search results

Twitter Clients for the iPhone

15. PocketTweets – Slick client for the iPhone

16. Twitteriffic

One of the most popular clients for Twitter on the iPhone.

17. TwitterFon

Favorite Twitter client for the iPhone because of simple navigation buttons that allow you to jump from one area to another.

18. Hahlo: Twitter Clients for the iPhone

Nice looking Twitter client with simple navigational menu system.

Niche Twitter Apps for the iPhone

19. AirMe

Send photos from your iPhone to Twitter with this free app which includes a Twitter client.

20. iMapMyRun

Lots of features for runners including Twitter access.

21. Jott

Record voice messages from your mobile device and post links to it on Twitter.

22. Locly

Location tracker with Twitter integration that shows tweets in your area.

23.  Loopt

Another location tracker with Twitter connection but also other services like Yelp.

25. Twinkle

Location based Twitter app that utilizes the GPS feature.

26. Twitfire

Upload photos to twitter and more.

27. Twitterlator

Manage multiple twitter accounts.

28. Twittervision

A world view of tweets from around the globe in real-time.

29. Twootball

Track all football scores and teams via this Twitter app.

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