I am currently using a mid 2011 MBA and running 10.8.5 which becomes unresponsive at times. Whith Activity monitor and Safari running there is just over 700MB avaiable. The spinning color pinwheel appears frequently. I hope this helps and more clearly expains my issue. I have have errors show up from time to time but don't have screen shots of those or remember what they were.
Active Memory: 603.7 MB
Free Memory: 647.2 MB
Wired Memory: 690.8 MB
Used Memory: 1.37 GB
Inactive Memory: 104.7 MB
Total VM: 207.16 GB
Number of processes: 82
PID Process Name User CPU Real Mem Virtual Mem
0 kernel_task root 1.7 258.2 MB 4.38 GB
1 launchd root 0.0 1.5 MB 2.36 GB
11 UserEventAgent root 0.0 3.7 MB 2.45 GB
12 kextd root 0.0 4.3 MB 2.39 GB
14 notifyd root 0.0 1.2 MB 2.37 GB
15 diskarbitrationd root 0.0 1.2 MB 2.37 GB
16 configd root 0.0 4.5 MB 2.39 GB
17 securityd root 0.0 3.3 MB 2.39 GB
18 syslogd root 0.0 1.3 MB 2.37 GB
20 distnoted root 0.0 1.6 MB 2.38 GB
21 opendirectoryd root 0.0 7.1 MB 2.54 GB
22 powerd root 0.0 2.6 MB 2.39 GB
30 coreservicesd root 0.0 5.0 MB 2.43 GB
33 fseventsd root 0.0 1.9 MB 2.40 GB
36 ntpd root 0.0 1.2 MB 2.37 GB
37 cupsd root 0.0 988 KB 2.43 GB
41 warmd nobody 0.0 1.4 MB 2.48 GB
42 usbmuxd _usbmuxd 0.0 776 KB 2.42 GB
45 stackshot root 0.0 460 KB 2.36 GB
46 SleepServicesD root 0.0 1.7 MB 2.39 GB
48 revisiond root 0.0 4 KB 2.42 GB
53 netbiosd _netbios 0.0 1.7 MB 2.40 GB
54 mtmfs root 0.0 3.3 MB 2.44 GB
55 mtmd root 0.0 3.9 MB 2.43 GB
56 mds root 0.0 11.6 MB 2.90 GB
57 mDNSResponder _mdnsrespo 0.0 3.2 MB 2.40 GB
60 loginwindow Lightofthe 0.0 30.9 MB 2.64 GB
61 locationd _locationd 0.0 2.1 MB 2.50 GB
62 KernelEventAgent root 0.0 420 KB 2.35 GB
64 hidd root 0.0 3.2 MB 2.42 GB
66 dynamic_pager root 0.0 20 KB 2.33 GB
69 appleeventsd _eppc 0.0 1.7 MB 2.41 GB
73 autofsd root 0.0 436 KB 2.39 GB
75 aosnotifyd root 0.0 1.6 MB 2.50 GB
76 socketfilterfw root 0.0 3.8 MB 2.44 GB
81 networkd _networkd 0.0 1.2 MB 2.36 GB
98 WindowServer _windowser 6.3 55.0 MB 2.92 GB
101 CVMServer root 0.0 1.1 MB 2.43 GB
116 logind root 0.0 1.2 MB 2.39 GB
131 launchd Lightofthe 0.0 1.3 MB 2.36 GB
134 UserEventAgent Lightofthe 0.0 8.2 MB 2.51 GB
135 distnoted Lightofthe 0.0 2.7 MB 2.38 GB
137 cfprefsd Lightofthe 0.0 1.9 MB 2.38 GB
145 talagent Lightofthe 0.0 2.9 MB 2.57 GB
146 Dock Lightofthe 0.0 23.0 MB 2.57 GB
147 SystemUIServer Lightofthe 0.3 18.7 MB 2.68 GB
148 Finder Lightofthe 0.0 35.7 MB 2.77 GB
149 coreaudiod _coreaudio 0.0 3.1 MB 2.52 GB
152 pboard Lightofthe 0.0 36 KB 2.33 GB
154 fontd Lightofthe 0.0 3.7 MB 2.44 GB
158 NetworkBrowserAgent Lightofthe 0.0 2.2 MB 2.39 GB
159 filecoordinationd root 0.0 2.9 MB 2.40 GB
164 usernoted Lightofthe 0.0 1.2 MB 2.44 GB
166 apsd root 0.0 8.1 MB 2.49 GB
169 activitymonitord root 0.7 1.6 MB 2.35 GB
170 imagent Lightofthe 0.0 2.9 MB 2.45 GB
171 Notification Center Lightofthe 0.0 10.2 MB 2.55 GB
174 com.apple.dock.extra Lightofthe 0.0 4.2 MB 2.62 GB
187 CalendarAgent Lightofthe 0.0 16.9 MB 2.60 GB
194 iTunes Helper Lightofthe 0.0 1.1 MB 2.46 GB
198 Speech Synthesis Server Lightofthe 0.0 2.3 MB 2.52 GB
202 CNSSelectorAgent Lightofthe 0.1 3.3 MB 2.51 GB
206 lsboxd Lightofthe 0.0 468 KB 2.42 GB
207 MemoryKeeper Lightofthe 0.3 7.8 MB 2.68 GB
222 AppleSpell.service Lightofthe 0.0 3.2 MB 2.44 GB
278 syspolicyd root 0.0 4 KB 2.37 GB
515 cfprefsd root 0.0 2.4 MB 2.37 GB
678 launchd _spotlight 0.0 604 KB 2.36 GB
682 distnoted _spotlight 0.0 996 KB 2.38 GB
683 cfprefsd _spotlight 0.0 740 KB 2.36 GB
692 tccd Lightofthe 0.0 1.1 MB 2.42 GB
697 xpcd Lightofthe 0.0 152 KB 2.48 GB
706 pbs Lightofthe 0.0 1.0 MB 2.39 GB
725 Safari Lightofthe 1.1 87.9 MB 3.80 GB
728 Safari Web Content Lightofthe 1.9 180.8 MB 3.92 GB
750 cookied Lightofthe 0.0 1.4 MB 2.37 GB
765 helpd Lightofthe 0.0 10.0 MB 2.44 GB
833 ocspd root 0.0 8.8 MB 2.38 GB
864 Activity Monitor Lightofthe 8.3 56.8 MB 2.63 GB
871 mdworker Lightofthe 0.0 23.6 MB 2.48 GB
872 Flash Player (Safari Inte Lightofthe 0.0 46.4 MB 3.65 GB
873 taskgated root 0.0 9.6 MB 2.39 GB