Ya I got the same 4gb card few days ago, no problems yet.
http://pdaphonehome.com/forums/597513-post249.html

I haven't gone past 2gb usage yet tho.
Link to the exact one I got (same seller as the other poster):
http://cgi.ebay.com/ws/eBayISAPI.dll...m=290066248872

Rom: 2.07.20 WWE
Date: 2/24/06

Only had the phone 11 days now... using 1402.47mb of 3978.21mb

Need to get me some bluetooth headphones... drop few 100 mp3s on it. I get paid friday... get that and the iblue 737 gps