I loved Accelerando but found his other novels to be not nearly as visionary or entertaining

Accelerando is available for free online: http://www.antipope.org/charlie/blog-static/fiction/accelera...

I checked it out years ago (for some small value of "years", I guess), and again earlier this year. I think it's aged well, although Charlie himself seems to have his doubts.

Missile Gap is fantastic.

Accelerando was ok. But I don't think any singularity fiction lives up to Vinge's classics (A Fire Upon the Deep etc).