Here are some 320×240 Java games

3D games - Coaster Rush, Battle Chess, Beach Ping Pong, Mini golf Castles, Jet Set Racing and some others (10 games each)

http://rapidshare.com/files/61878913/1.rar
http://www.badongo.com/file/4679940

http://rapidshare.com/files/61880903/2.rar
http://www.badongo.com/file/4680050

and one more compilation of 240×320 Java games (48 games)

http://rapidshare.com/files/61880684/48_Java_Games_240×320.7z
http://www.badongo.com/file/4679920