Hopefully this post will give you a framework and the information to allow you to get more out of this year's draft as you follow along.
WHEN:
Monday: 4:00 PDT - Round 1 (picks 1 thru 60). Pre-draft show begins at 3:00 PST. The Giants pick #20, which should occur at around the <strike>3-hour mark (7:00 PST)</strike> 90-minute mark (5:30 PDT).
Tuesday: 9:00 am PDT - Rounds 2 - 15
Wednesday: 9:00 am PDT - Rounds 16 - 40
WHERE:
All 3 days and all 40 rounds will be live-streamed on your PC @ mlb.com: http://mlb.mlb.com/mlb/events/draft/y2012/
Monday's broadcast will also be simulcast on your TV on the MLB Network (if you get that channel) with "expert analysis" and "famous" guests. The Tuesday and Wednesday broadcasts are audio-only internet feeds with no video.
WHO: putting facts, figures, and faces to the names you hear called off:
MLB.com's final mock draft (Jonathan Mayo - who will be ne of the MLB Network's on-air Draft Analysts):
http://mlb.mlb.com/news/article.jsp?ymd=20120531&content_id=32543884&vkey=news_mlb&c_id=mlb
Baseball America's mock draft (Jim Callis):
http://www.baseballamerica.com/blog/draft/2012/06/mock-draft-v3-0-list-only/#more-4778
Final pre-draft Top 500 prospects list by Basball America:
http://www.baseballamerica.com/draft-preview/?srch=byNatRank&top=500&submit=Search#
Perfect Game website, with searchable player scouting reports database:
http://www.perfectgame.org/
Jon Klima's Baseball Prospect Report website - contains an alphabetical listing and links to all of the 2012 propsects that
he has personally scouted and written about. Includes lots of vid clips:
http://www.bbprospectreport.com/2012-draft
Here's my fanpost where I included detailed writeups of several dozen prospects that I'd like for the Giants to consider drafting in the first through 20th rounds:
http://www.mccoveychronicles.com/2012/6/1/3056910/2012-draft-a-short-list-of-prospects-that-interest-me-with-in-depth
Here's another of my fanposts where I give a short tutorial on the new Collective Bargaining Agreement rules that pertain to the draft, along with my analysis of how I expect the new rules to affect the Giants and other teams in this year's draft:
http://www.mccoveychronicles.com/2012/5/31/3056315/2012-draft-how-will-the-new-cba-rules-affect-the-draft-and-the-giants
That's the bare bones that I think you'll need to follow and enjoy the draft.