Jargong impressed me when I first got in to see the site. It does way way way more than Twitter. So go read that ifno for Flickr and all the chat client support. But as for Twitter: 
* View “Me and friends”, “Everyone”, “Friend list” and “Follower list” timelines.
* Automatically refresh (every two minutes) “Me and friends” timeline if you want. Set automatic or manual refresh in “My settings”.
* When logging in to Jargong the client can automatically fetch your status message from Twitter and set it as your IM status message. Turn this feature on or off in “My settings”.
* When updating your IM status message in Jargong the status message in Twitter can automatically be updated. Turn this feature on or off in “My settings”.
Jargong works with the following phones:
Sony Ericsson
D750
K550
K600
K608
K610
K618
K790
K800
K750
K810
V600
W600
W550
W610
W700
W710
W800
W830
W850
W880
W900
Z520
Z550
Z558
Z610
Z710
Nokia
3250
5500
6110
6290
E50
E60
E61
E65
E70
N70
N72
N73
N75
N76
N77
N80
N91
N92
N93
N95
Filed under: Mobile Clients, Jargong