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Yes, it is a persistent little booger.
If rooted you can remove the apk in Root Explorer in /system/apps.
Since you downloaded the app from Market, try this if not rooted: reinstall the app, then go into menu > settings > applications > manage applications > sort by "all," then find it and even if the uninstall button is greyed out, clear data and cache (if they're not greyed out) and clear defaults (if it's not greyed out).
Then reboot. Once up, go back and the uninstall button will probably by present. I've seen mixed reports on this method, from device to device, it's worth a shot.![]()