I have an SSI recip table on about 400 older AVS sites that links back to 5 of my main sites and a few friends sites, about 75% are one-way, and it seems to boost my PR pretty quickly on the new sites I add to the mix, but that's about it. Doesn't help rankings for keywords, phrases, the important shit. Some of the one-way sites have high PR, some don't, some have good rankings, some don't, and the two don't appear to be related. I don't spend much time thinking about it
