Redis is perfectly fine for this application, both from the point of view of data persistence since AOF is very durable, and from the point of view of space needed. This application is designed to hold a lot of news and comments even using little memory.

> This application is designed to hold a lot of news and comments even using little memory.

Can you post some benchmarks on that? Would like to see how many (average sized) news/comments can be stored on the 512mb VPS.

Considering the creator of lamernews is also one of the creators of redis, he probably knows what hes doing.