If you've been lax in your Club Nintendo registration recently, we suggest you go register those DSi XLs, black Wiis, copies of WarioWare DIY, and your other first-party stuff. The Club Nintendo "year" -- during which your earned Coins will count up toward Platinum or Gold status -- elapses June 30.
300 Coins will get you Gold status, and 600 will get you Platinum -- and both of those will get you free stuff, on top of whatever you choose to spend those Coins on. Last year, those who reached Platinum had their choice of a plush Mario hat or a downloadable variant of Punch-Out!!, while Gold status holders received a calendar. While we don't know what this year's prizes will be, we know they'll be free, and thus it would be a shame if you missed out on them unnecessarily.