Twitbit

Twitbit is a Twitter client for iPhone and iPod Touch with built-in push notifications.

Twitbit is designed to keep the simple things simple. The most important features are never more than a tap away.

Twitbit was the first full-featured Twitter iPhone app to provide full support for push notifications. You'll be sent an alert when you receive a direct messages or when you're mentioned. Twitbit also supports configuring whether alerts are received for mentions and direct messages individually, on a per-account basis. Don't want push notifications at all? Just turn them off in Settings.

If you're interested in trying before you buy, check out Twitbit Lite. A complete list of feature differences can be found at http://twitbitapp.com.

The Fundamentals - Multiple accounts - Browse your timeline and mentions - A built-in conversation view - View direct messages as threaded conversations organized by user, just like in the built-in Messages application. - Landscape keyboard for composing tweets and direct messages. - View your and other people's profile - View user's location on a map - Browse users' followers and following list - Start or stop following people - Block and unblock users - Follow conversations as far as they go - Mark tweets as favorites - Save drafts of tweets and direct messages - Upload pictures to Twitpic - Email links to tweets, and open tweets in the built-in web browser or Safari - Customizable re-tweet format

Push Notifications - Receive alerts for new mentions and direct messages - Keep tabs on all of your accounts, without the hassle of constantly switching between them - Configure whether you receive push notifications for mentions, direct messages, both, or neither. A separate configuration can be set for each account.

Integration - Upload photos to Flickr, Yfrog, and TwitPic - Upload videos to Flickr, Yfrog, and TwitVid (requires iPhone 3GS) - Save web pages to Instapaper - Shorten links with bit.ly

Browsing - View links in an embedded browser with support for landscape mode - View photos from popular photo sharing services in an embedded photo browser, with support for landscape mode - Email or tweet pages from within the browser

Persistence - Browse previously viewed tweets without a network connection - Catch up on old tweets while you wait for a new set to be downloaded - Your timeline position is saved and restored the next time you start the app

Search - Search Twitter to find out what everyone's saying about your favorite topics - Save searches so you can run them again later - Searches are saved automatically in a "recents" list, allowing you to run a previous search again even if you didn't save it. - Search nearby - Search for individual users - View current, daily, and weekly trends