As in, the last track is a reprise of the first track, or just references the first track in some way. I like when albums do this. Feels album-y.

Examples:

British Sea Power - Do You Like Rock Music? (All In It / We Close Our Eyes)
A Hawk & A Hacksaw - The Way The Wind Blows (In The River / There Is A River In Galisteo)
R.E.M. - Collapse Into Now (Discoverer / Blue)
Gil Scott-Heron - I'm New Here (On Coming From A Broken Home Pt.1 / On Coming From A Broken Home Pt.2)
LCD Soundsystem - This Is Happening (Dance Yrself Clean / Home)

Any more?