Do you use microformats in your web projects?

I’ve used microformats fairly extensively. The benefits I see are

• access to data for robots like Google Rich Snippets
• access to data for users via µF-comsuming tools like H2VX
• (some) data validation
• more meaningful markup, which makes me happy

(minor) disadvantages are

• time; hand-coding these things can be a pita. Either add programmatically (e.g. generate from data in CMS) or make a bunch of snippets. If doing via a CMS then it’s (for me) a no-brainer
• require extra attention to UI to do well (best if exposed, but that often involves custom icon etc)

Microformats work fine as-is in HTML5. There are new HTML5 elements that map well to some µF functions, notably <time>, but be warned that current µF tools generally can’t cope with HTML5’s new elements (“Tool support” slide).

Your other alternatives are HTML5’s microdata, and RDFa. Microdata is pretty nice, but quite new so doesn’t have many tools available. You can represent microformats in microdata, and the HTML5 spec has microdata versions of vCard and vCal. There’s also HTML5’s data- attribute, but that’s for private use and doesn’t encode visible data, so is probably not what you’re after.

I perceive these three as a contin