I'd be most hopeful for a solution from AssistiveWare if Apple doesn't come through with improvements to VoiceOver with Leopard. From the descriptions by David Niemeijer their GhostReader Text-to-Speech software can do navigation by paragraphs and sentences, with the option to repeat.
Here's a section from his response on September 15 on the subject of ghost reader and InfoVox iVox: GhostReader is currently slightly ahead of VisioVoice with functions to go back to the start of a sentence or skip to the next paragraph or sentence. These will probably added to VisioVoice 1.2 in the future. Basically, these two applications will be feature hopping a bit with regard to their reader functionality with sometimes a new feature appearing in one first and sometimes in the other first. Cheers, Esther
