Looks like Gravity just got a major competitor. Nimbuzz has released a new version of its free Symbian client with "industry-first Homescreen Notifications and sophisticated Twitter functionality". The new version 2.2 also has full kinetic scrolling on all touchscreen phones, a number of layout improvements and ties in with the NimbuzzOut rate calculator for international calls. Full details, screens and links below.

From the press release:

"From today, Nimbuzz users on Symbian can enjoy integration with the world’s fastest-growing social network, as Nimbuzz incorporates a feature-rich Twitter client that includes Timelines, Direct Messaging, Searches, Trends and Profiles, and outperforms standalone Twitter applications.

A world first for Symbian handsets is the introduction of pop-up notifications on the homescreen , notifying users of incoming chats and events, while the application runs in the background."

Nimbuzz v2.2 is available as a free download from Symbian app stores, such as Nokia’s Ovi Store, and from www.nimbuzz.com.

More from the press release:

"The Symbian release comes at a time of phenomenal growth for Nimbuzz; having passed the 13 million registration milestone last month, Nimbuzz now enjoys a current growth rate of over a million new registrations each month (that’s a new Nimbuzz user every 3 seconds!), an active user base of over 30% and an international user footprint of 220 countries, covering every corner of the globe."